Commit | Line | Data |
---|---|---|
ad7f8a1f DA |
1 | /* |
2 | * Copyright © 2014 Red Hat | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/sched.h> | |
75bc08ab | 28 | #include <linux/seq_file.h> |
ad7f8a1f DA |
29 | #include <linux/i2c.h> |
30 | #include <drm/drm_dp_mst_helper.h> | |
31 | #include <drm/drmP.h> | |
32 | ||
33 | #include <drm/drm_fixed.h> | |
34 | ||
35 | /** | |
36 | * DOC: dp mst helper | |
37 | * | |
38 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport | |
39 | * protocol. The helpers contain a topology manager and bandwidth manager. | |
40 | * The helpers encapsulate the sending and received of sideband msgs. | |
41 | */ | |
42 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
43 | char *buf); | |
44 | static int test_calc_pbn_mode(void); | |
45 | ||
46 | static void drm_dp_put_port(struct drm_dp_mst_port *port); | |
47 | ||
48 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
49 | int id, | |
50 | struct drm_dp_payload *payload); | |
51 | ||
52 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
53 | struct drm_dp_mst_port *port, | |
54 | int offset, int size, u8 *bytes); | |
55 | ||
68d8c9fc DA |
56 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
57 | struct drm_dp_mst_branch *mstb); | |
ad7f8a1f DA |
58 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
59 | struct drm_dp_mst_branch *mstb, | |
60 | struct drm_dp_mst_port *port); | |
61 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
62 | u8 *guid); | |
63 | ||
64 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); | |
65 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); | |
66 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); | |
67 | /* sideband msg handling */ | |
68 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) | |
69 | { | |
70 | u8 bitmask = 0x80; | |
71 | u8 bitshift = 7; | |
72 | u8 array_index = 0; | |
73 | int number_of_bits = num_nibbles * 4; | |
74 | u8 remainder = 0; | |
75 | ||
76 | while (number_of_bits != 0) { | |
77 | number_of_bits--; | |
78 | remainder <<= 1; | |
79 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
80 | bitmask >>= 1; | |
81 | bitshift--; | |
82 | if (bitmask == 0) { | |
83 | bitmask = 0x80; | |
84 | bitshift = 7; | |
85 | array_index++; | |
86 | } | |
87 | if ((remainder & 0x10) == 0x10) | |
88 | remainder ^= 0x13; | |
89 | } | |
90 | ||
91 | number_of_bits = 4; | |
92 | while (number_of_bits != 0) { | |
93 | number_of_bits--; | |
94 | remainder <<= 1; | |
95 | if ((remainder & 0x10) != 0) | |
96 | remainder ^= 0x13; | |
97 | } | |
98 | ||
99 | return remainder; | |
100 | } | |
101 | ||
102 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) | |
103 | { | |
104 | u8 bitmask = 0x80; | |
105 | u8 bitshift = 7; | |
106 | u8 array_index = 0; | |
107 | int number_of_bits = number_of_bytes * 8; | |
108 | u16 remainder = 0; | |
109 | ||
110 | while (number_of_bits != 0) { | |
111 | number_of_bits--; | |
112 | remainder <<= 1; | |
113 | remainder |= (data[array_index] & bitmask) >> bitshift; | |
114 | bitmask >>= 1; | |
115 | bitshift--; | |
116 | if (bitmask == 0) { | |
117 | bitmask = 0x80; | |
118 | bitshift = 7; | |
119 | array_index++; | |
120 | } | |
121 | if ((remainder & 0x100) == 0x100) | |
122 | remainder ^= 0xd5; | |
123 | } | |
124 | ||
125 | number_of_bits = 8; | |
126 | while (number_of_bits != 0) { | |
127 | number_of_bits--; | |
128 | remainder <<= 1; | |
129 | if ((remainder & 0x100) != 0) | |
130 | remainder ^= 0xd5; | |
131 | } | |
132 | ||
133 | return remainder & 0xff; | |
134 | } | |
135 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) | |
136 | { | |
137 | u8 size = 3; | |
138 | size += (hdr->lct / 2); | |
139 | return size; | |
140 | } | |
141 | ||
142 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
143 | u8 *buf, int *len) | |
144 | { | |
145 | int idx = 0; | |
146 | int i; | |
147 | u8 crc4; | |
148 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); | |
149 | for (i = 0; i < (hdr->lct / 2); i++) | |
150 | buf[idx++] = hdr->rad[i]; | |
151 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | | |
152 | (hdr->msg_len & 0x3f); | |
153 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); | |
154 | ||
155 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); | |
156 | buf[idx - 1] |= (crc4 & 0xf); | |
157 | ||
158 | *len = idx; | |
159 | } | |
160 | ||
161 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, | |
162 | u8 *buf, int buflen, u8 *hdrlen) | |
163 | { | |
164 | u8 crc4; | |
165 | u8 len; | |
166 | int i; | |
167 | u8 idx; | |
168 | if (buf[0] == 0) | |
169 | return false; | |
170 | len = 3; | |
171 | len += ((buf[0] & 0xf0) >> 4) / 2; | |
172 | if (len > buflen) | |
173 | return false; | |
174 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); | |
175 | ||
176 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { | |
177 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); | |
178 | return false; | |
179 | } | |
180 | ||
181 | hdr->lct = (buf[0] & 0xf0) >> 4; | |
182 | hdr->lcr = (buf[0] & 0xf); | |
183 | idx = 1; | |
184 | for (i = 0; i < (hdr->lct / 2); i++) | |
185 | hdr->rad[i] = buf[idx++]; | |
186 | hdr->broadcast = (buf[idx] >> 7) & 0x1; | |
187 | hdr->path_msg = (buf[idx] >> 6) & 0x1; | |
188 | hdr->msg_len = buf[idx] & 0x3f; | |
189 | idx++; | |
190 | hdr->somt = (buf[idx] >> 7) & 0x1; | |
191 | hdr->eomt = (buf[idx] >> 6) & 0x1; | |
192 | hdr->seqno = (buf[idx] >> 4) & 0x1; | |
193 | idx++; | |
194 | *hdrlen = idx; | |
195 | return true; | |
196 | } | |
197 | ||
198 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, | |
199 | struct drm_dp_sideband_msg_tx *raw) | |
200 | { | |
201 | int idx = 0; | |
202 | int i; | |
203 | u8 *buf = raw->msg; | |
204 | buf[idx++] = req->req_type & 0x7f; | |
205 | ||
206 | switch (req->req_type) { | |
207 | case DP_ENUM_PATH_RESOURCES: | |
208 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; | |
209 | idx++; | |
210 | break; | |
211 | case DP_ALLOCATE_PAYLOAD: | |
212 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | | |
213 | (req->u.allocate_payload.number_sdp_streams & 0xf); | |
214 | idx++; | |
215 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); | |
216 | idx++; | |
217 | buf[idx] = (req->u.allocate_payload.pbn >> 8); | |
218 | idx++; | |
219 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); | |
220 | idx++; | |
221 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { | |
222 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | | |
223 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); | |
224 | idx++; | |
225 | } | |
226 | if (req->u.allocate_payload.number_sdp_streams & 1) { | |
227 | i = req->u.allocate_payload.number_sdp_streams - 1; | |
228 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; | |
229 | idx++; | |
230 | } | |
231 | break; | |
232 | case DP_QUERY_PAYLOAD: | |
233 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; | |
234 | idx++; | |
235 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); | |
236 | idx++; | |
237 | break; | |
238 | case DP_REMOTE_DPCD_READ: | |
239 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; | |
240 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; | |
241 | idx++; | |
242 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; | |
243 | idx++; | |
244 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); | |
245 | idx++; | |
246 | buf[idx] = (req->u.dpcd_read.num_bytes); | |
247 | idx++; | |
248 | break; | |
249 | ||
250 | case DP_REMOTE_DPCD_WRITE: | |
251 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; | |
252 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; | |
253 | idx++; | |
254 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; | |
255 | idx++; | |
256 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); | |
257 | idx++; | |
258 | buf[idx] = (req->u.dpcd_write.num_bytes); | |
259 | idx++; | |
260 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); | |
261 | idx += req->u.dpcd_write.num_bytes; | |
262 | break; | |
263 | case DP_REMOTE_I2C_READ: | |
264 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; | |
265 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); | |
266 | idx++; | |
267 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { | |
268 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; | |
269 | idx++; | |
270 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; | |
271 | idx++; | |
272 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); | |
273 | idx += req->u.i2c_read.transactions[i].num_bytes; | |
274 | ||
275 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; | |
276 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); | |
277 | idx++; | |
278 | } | |
279 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; | |
280 | idx++; | |
281 | buf[idx] = (req->u.i2c_read.num_bytes_read); | |
282 | idx++; | |
283 | break; | |
284 | ||
285 | case DP_REMOTE_I2C_WRITE: | |
286 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; | |
287 | idx++; | |
288 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; | |
289 | idx++; | |
290 | buf[idx] = (req->u.i2c_write.num_bytes); | |
291 | idx++; | |
292 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); | |
293 | idx += req->u.i2c_write.num_bytes; | |
294 | break; | |
295 | } | |
296 | raw->cur_len = idx; | |
297 | } | |
298 | ||
299 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) | |
300 | { | |
301 | u8 crc4; | |
302 | crc4 = drm_dp_msg_data_crc4(msg, len); | |
303 | msg[len] = crc4; | |
304 | } | |
305 | ||
306 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, | |
307 | struct drm_dp_sideband_msg_tx *raw) | |
308 | { | |
309 | int idx = 0; | |
310 | u8 *buf = raw->msg; | |
311 | ||
312 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); | |
313 | ||
314 | raw->cur_len = idx; | |
315 | } | |
316 | ||
317 | /* this adds a chunk of msg to the builder to get the final msg */ | |
318 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, | |
319 | u8 *replybuf, u8 replybuflen, bool hdr) | |
320 | { | |
321 | int ret; | |
322 | u8 crc4; | |
323 | ||
324 | if (hdr) { | |
325 | u8 hdrlen; | |
326 | struct drm_dp_sideband_msg_hdr recv_hdr; | |
327 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); | |
328 | if (ret == false) { | |
329 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); | |
330 | return false; | |
331 | } | |
332 | ||
333 | /* get length contained in this portion */ | |
334 | msg->curchunk_len = recv_hdr.msg_len; | |
335 | msg->curchunk_hdrlen = hdrlen; | |
336 | ||
337 | /* we have already gotten an somt - don't bother parsing */ | |
338 | if (recv_hdr.somt && msg->have_somt) | |
339 | return false; | |
340 | ||
341 | if (recv_hdr.somt) { | |
342 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); | |
343 | msg->have_somt = true; | |
344 | } | |
345 | if (recv_hdr.eomt) | |
346 | msg->have_eomt = true; | |
347 | ||
348 | /* copy the bytes for the remainder of this header chunk */ | |
349 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); | |
350 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); | |
351 | } else { | |
352 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); | |
353 | msg->curchunk_idx += replybuflen; | |
354 | } | |
355 | ||
356 | if (msg->curchunk_idx >= msg->curchunk_len) { | |
357 | /* do CRC */ | |
358 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); | |
359 | /* copy chunk into bigger msg */ | |
360 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); | |
361 | msg->curlen += msg->curchunk_len - 1; | |
362 | } | |
363 | return true; | |
364 | } | |
365 | ||
366 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, | |
367 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
368 | { | |
369 | int idx = 1; | |
370 | int i; | |
371 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); | |
372 | idx += 16; | |
373 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; | |
374 | idx++; | |
375 | if (idx > raw->curlen) | |
376 | goto fail_len; | |
377 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { | |
378 | if (raw->msg[idx] & 0x80) | |
379 | repmsg->u.link_addr.ports[i].input_port = 1; | |
380 | ||
381 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; | |
382 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); | |
383 | ||
384 | idx++; | |
385 | if (idx > raw->curlen) | |
386 | goto fail_len; | |
387 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; | |
388 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; | |
389 | if (repmsg->u.link_addr.ports[i].input_port == 0) | |
390 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
391 | idx++; | |
392 | if (idx > raw->curlen) | |
393 | goto fail_len; | |
394 | if (repmsg->u.link_addr.ports[i].input_port == 0) { | |
395 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); | |
396 | idx++; | |
397 | if (idx > raw->curlen) | |
398 | goto fail_len; | |
399 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); | |
400 | idx += 16; | |
401 | if (idx > raw->curlen) | |
402 | goto fail_len; | |
403 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; | |
404 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); | |
405 | idx++; | |
406 | ||
407 | } | |
408 | if (idx > raw->curlen) | |
409 | goto fail_len; | |
410 | } | |
411 | ||
412 | return true; | |
413 | fail_len: | |
414 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
415 | return false; | |
416 | } | |
417 | ||
418 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, | |
419 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
420 | { | |
421 | int idx = 1; | |
422 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; | |
423 | idx++; | |
424 | if (idx > raw->curlen) | |
425 | goto fail_len; | |
426 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; | |
427 | if (idx > raw->curlen) | |
428 | goto fail_len; | |
429 | ||
430 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); | |
431 | return true; | |
432 | fail_len: | |
433 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); | |
434 | return false; | |
435 | } | |
436 | ||
437 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, | |
438 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
439 | { | |
440 | int idx = 1; | |
441 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; | |
442 | idx++; | |
443 | if (idx > raw->curlen) | |
444 | goto fail_len; | |
445 | return true; | |
446 | fail_len: | |
447 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); | |
448 | return false; | |
449 | } | |
450 | ||
451 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, | |
452 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
453 | { | |
454 | int idx = 1; | |
455 | ||
456 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); | |
457 | idx++; | |
458 | if (idx > raw->curlen) | |
459 | goto fail_len; | |
460 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; | |
461 | idx++; | |
462 | /* TODO check */ | |
463 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); | |
464 | return true; | |
465 | fail_len: | |
466 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); | |
467 | return false; | |
468 | } | |
469 | ||
470 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, | |
471 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
472 | { | |
473 | int idx = 1; | |
474 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; | |
475 | idx++; | |
476 | if (idx > raw->curlen) | |
477 | goto fail_len; | |
478 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
479 | idx += 2; | |
480 | if (idx > raw->curlen) | |
481 | goto fail_len; | |
482 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
483 | idx += 2; | |
484 | if (idx > raw->curlen) | |
485 | goto fail_len; | |
486 | return true; | |
487 | fail_len: | |
488 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); | |
489 | return false; | |
490 | } | |
491 | ||
492 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
493 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
494 | { | |
495 | int idx = 1; | |
496 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
497 | idx++; | |
498 | if (idx > raw->curlen) | |
499 | goto fail_len; | |
500 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; | |
501 | idx++; | |
502 | if (idx > raw->curlen) | |
503 | goto fail_len; | |
504 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); | |
505 | idx += 2; | |
506 | if (idx > raw->curlen) | |
507 | goto fail_len; | |
508 | return true; | |
509 | fail_len: | |
510 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); | |
511 | return false; | |
512 | } | |
513 | ||
514 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, | |
515 | struct drm_dp_sideband_msg_reply_body *repmsg) | |
516 | { | |
517 | int idx = 1; | |
518 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; | |
519 | idx++; | |
520 | if (idx > raw->curlen) | |
521 | goto fail_len; | |
522 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
523 | idx += 2; | |
524 | if (idx > raw->curlen) | |
525 | goto fail_len; | |
526 | return true; | |
527 | fail_len: | |
528 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); | |
529 | return false; | |
530 | } | |
531 | ||
532 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, | |
533 | struct drm_dp_sideband_msg_reply_body *msg) | |
534 | { | |
535 | memset(msg, 0, sizeof(*msg)); | |
536 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; | |
537 | msg->req_type = (raw->msg[0] & 0x7f); | |
538 | ||
539 | if (msg->reply_type) { | |
540 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); | |
541 | msg->u.nak.reason = raw->msg[17]; | |
542 | msg->u.nak.nak_data = raw->msg[18]; | |
543 | return false; | |
544 | } | |
545 | ||
546 | switch (msg->req_type) { | |
547 | case DP_LINK_ADDRESS: | |
548 | return drm_dp_sideband_parse_link_address(raw, msg); | |
549 | case DP_QUERY_PAYLOAD: | |
550 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); | |
551 | case DP_REMOTE_DPCD_READ: | |
552 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); | |
553 | case DP_REMOTE_DPCD_WRITE: | |
554 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); | |
555 | case DP_REMOTE_I2C_READ: | |
556 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); | |
557 | case DP_ENUM_PATH_RESOURCES: | |
558 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); | |
559 | case DP_ALLOCATE_PAYLOAD: | |
560 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); | |
561 | default: | |
562 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); | |
563 | return false; | |
564 | } | |
565 | } | |
566 | ||
567 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
568 | struct drm_dp_sideband_msg_req_body *msg) | |
569 | { | |
570 | int idx = 1; | |
571 | ||
572 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
573 | idx++; | |
574 | if (idx > raw->curlen) | |
575 | goto fail_len; | |
576 | ||
577 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); | |
578 | idx += 16; | |
579 | if (idx > raw->curlen) | |
580 | goto fail_len; | |
581 | ||
582 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; | |
583 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; | |
584 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; | |
585 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; | |
586 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); | |
587 | idx++; | |
588 | return true; | |
589 | fail_len: | |
590 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); | |
591 | return false; | |
592 | } | |
593 | ||
594 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, | |
595 | struct drm_dp_sideband_msg_req_body *msg) | |
596 | { | |
597 | int idx = 1; | |
598 | ||
599 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; | |
600 | idx++; | |
601 | if (idx > raw->curlen) | |
602 | goto fail_len; | |
603 | ||
604 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); | |
605 | idx += 16; | |
606 | if (idx > raw->curlen) | |
607 | goto fail_len; | |
608 | ||
609 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); | |
610 | idx++; | |
611 | return true; | |
612 | fail_len: | |
613 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); | |
614 | return false; | |
615 | } | |
616 | ||
617 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, | |
618 | struct drm_dp_sideband_msg_req_body *msg) | |
619 | { | |
620 | memset(msg, 0, sizeof(*msg)); | |
621 | msg->req_type = (raw->msg[0] & 0x7f); | |
622 | ||
623 | switch (msg->req_type) { | |
624 | case DP_CONNECTION_STATUS_NOTIFY: | |
625 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); | |
626 | case DP_RESOURCE_STATUS_NOTIFY: | |
627 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); | |
628 | default: | |
629 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); | |
630 | return false; | |
631 | } | |
632 | } | |
633 | ||
634 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) | |
635 | { | |
636 | struct drm_dp_sideband_msg_req_body req; | |
637 | ||
638 | req.req_type = DP_REMOTE_DPCD_WRITE; | |
639 | req.u.dpcd_write.port_number = port_num; | |
640 | req.u.dpcd_write.dpcd_address = offset; | |
641 | req.u.dpcd_write.num_bytes = num_bytes; | |
642 | req.u.dpcd_write.bytes = bytes; | |
643 | drm_dp_encode_sideband_req(&req, msg); | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) | |
649 | { | |
650 | struct drm_dp_sideband_msg_req_body req; | |
651 | ||
652 | req.req_type = DP_LINK_ADDRESS; | |
653 | drm_dp_encode_sideband_req(&req, msg); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) | |
658 | { | |
659 | struct drm_dp_sideband_msg_req_body req; | |
660 | ||
661 | req.req_type = DP_ENUM_PATH_RESOURCES; | |
662 | req.u.port_num.port_number = port_num; | |
663 | drm_dp_encode_sideband_req(&req, msg); | |
664 | msg->path_msg = true; | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, | |
ef8f9bea LY |
669 | u8 vcpi, uint16_t pbn, |
670 | u8 number_sdp_streams, | |
671 | u8 *sdp_stream_sink) | |
ad7f8a1f DA |
672 | { |
673 | struct drm_dp_sideband_msg_req_body req; | |
674 | memset(&req, 0, sizeof(req)); | |
675 | req.req_type = DP_ALLOCATE_PAYLOAD; | |
676 | req.u.allocate_payload.port_number = port_num; | |
677 | req.u.allocate_payload.vcpi = vcpi; | |
678 | req.u.allocate_payload.pbn = pbn; | |
ef8f9bea LY |
679 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
680 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, | |
681 | number_sdp_streams); | |
ad7f8a1f DA |
682 | drm_dp_encode_sideband_req(&req, msg); |
683 | msg->path_msg = true; | |
684 | return 0; | |
685 | } | |
686 | ||
687 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
688 | struct drm_dp_vcpi *vcpi) | |
689 | { | |
dfda0df3 | 690 | int ret, vcpi_ret; |
ad7f8a1f DA |
691 | |
692 | mutex_lock(&mgr->payload_lock); | |
693 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); | |
694 | if (ret > mgr->max_payloads) { | |
695 | ret = -EINVAL; | |
696 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); | |
697 | goto out_unlock; | |
698 | } | |
699 | ||
dfda0df3 DA |
700 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
701 | if (vcpi_ret > mgr->max_payloads) { | |
702 | ret = -EINVAL; | |
703 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); | |
704 | goto out_unlock; | |
705 | } | |
706 | ||
ad7f8a1f | 707 | set_bit(ret, &mgr->payload_mask); |
dfda0df3 DA |
708 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
709 | vcpi->vcpi = vcpi_ret + 1; | |
ad7f8a1f DA |
710 | mgr->proposed_vcpis[ret - 1] = vcpi; |
711 | out_unlock: | |
712 | mutex_unlock(&mgr->payload_lock); | |
713 | return ret; | |
714 | } | |
715 | ||
716 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, | |
dfda0df3 | 717 | int vcpi) |
ad7f8a1f | 718 | { |
dfda0df3 DA |
719 | int i; |
720 | if (vcpi == 0) | |
ad7f8a1f DA |
721 | return; |
722 | ||
723 | mutex_lock(&mgr->payload_lock); | |
dfda0df3 DA |
724 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
725 | clear_bit(vcpi - 1, &mgr->vcpi_mask); | |
726 | ||
727 | for (i = 0; i < mgr->max_payloads; i++) { | |
728 | if (mgr->proposed_vcpis[i]) | |
729 | if (mgr->proposed_vcpis[i]->vcpi == vcpi) { | |
730 | mgr->proposed_vcpis[i] = NULL; | |
731 | clear_bit(i + 1, &mgr->payload_mask); | |
732 | } | |
733 | } | |
ad7f8a1f DA |
734 | mutex_unlock(&mgr->payload_lock); |
735 | } | |
736 | ||
737 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, | |
738 | struct drm_dp_sideband_msg_tx *txmsg) | |
739 | { | |
740 | bool ret; | |
cd961bb9 DV |
741 | |
742 | /* | |
743 | * All updates to txmsg->state are protected by mgr->qlock, and the two | |
744 | * cases we check here are terminal states. For those the barriers | |
745 | * provided by the wake_up/wait_event pair are enough. | |
746 | */ | |
ad7f8a1f DA |
747 | ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || |
748 | txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); | |
ad7f8a1f DA |
749 | return ret; |
750 | } | |
751 | ||
752 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, | |
753 | struct drm_dp_sideband_msg_tx *txmsg) | |
754 | { | |
755 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; | |
756 | int ret; | |
757 | ||
758 | ret = wait_event_timeout(mgr->tx_waitq, | |
759 | check_txmsg_state(mgr, txmsg), | |
760 | (4 * HZ)); | |
761 | mutex_lock(&mstb->mgr->qlock); | |
762 | if (ret > 0) { | |
763 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { | |
764 | ret = -EIO; | |
765 | goto out; | |
766 | } | |
767 | } else { | |
768 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); | |
769 | ||
770 | /* dump some state */ | |
771 | ret = -EIO; | |
772 | ||
773 | /* remove from q */ | |
774 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || | |
775 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { | |
776 | list_del(&txmsg->next); | |
777 | } | |
778 | ||
779 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || | |
780 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { | |
781 | mstb->tx_slots[txmsg->seqno] = NULL; | |
782 | } | |
783 | } | |
784 | out: | |
785 | mutex_unlock(&mgr->qlock); | |
786 | ||
787 | return ret; | |
788 | } | |
789 | ||
790 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) | |
791 | { | |
792 | struct drm_dp_mst_branch *mstb; | |
793 | ||
794 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); | |
795 | if (!mstb) | |
796 | return NULL; | |
797 | ||
798 | mstb->lct = lct; | |
799 | if (lct > 1) | |
800 | memcpy(mstb->rad, rad, lct / 2); | |
801 | INIT_LIST_HEAD(&mstb->ports); | |
802 | kref_init(&mstb->kref); | |
803 | return mstb; | |
804 | } | |
805 | ||
91a25e46 ML |
806 | static void drm_dp_free_mst_port(struct kref *kref); |
807 | ||
808 | static void drm_dp_free_mst_branch_device(struct kref *kref) | |
809 | { | |
810 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); | |
811 | if (mstb->port_parent) { | |
812 | if (list_empty(&mstb->port_parent->next)) | |
813 | kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); | |
814 | } | |
815 | kfree(mstb); | |
816 | } | |
817 | ||
ad7f8a1f DA |
818 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
819 | { | |
820 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); | |
821 | struct drm_dp_mst_port *port, *tmp; | |
822 | bool wake_tx = false; | |
823 | ||
91a25e46 ML |
824 | /* |
825 | * init kref again to be used by ports to remove mst branch when it is | |
826 | * not needed anymore | |
827 | */ | |
828 | kref_init(kref); | |
829 | ||
830 | if (mstb->port_parent && list_empty(&mstb->port_parent->next)) | |
831 | kref_get(&mstb->port_parent->kref); | |
832 | ||
ad7f8a1f DA |
833 | /* |
834 | * destroy all ports - don't need lock | |
835 | * as there are no more references to the mst branch | |
836 | * device at this point. | |
837 | */ | |
838 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { | |
839 | list_del(&port->next); | |
840 | drm_dp_put_port(port); | |
841 | } | |
842 | ||
843 | /* drop any tx slots msg */ | |
844 | mutex_lock(&mstb->mgr->qlock); | |
845 | if (mstb->tx_slots[0]) { | |
846 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
847 | mstb->tx_slots[0] = NULL; | |
848 | wake_tx = true; | |
849 | } | |
850 | if (mstb->tx_slots[1]) { | |
851 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
852 | mstb->tx_slots[1] = NULL; | |
853 | wake_tx = true; | |
854 | } | |
855 | mutex_unlock(&mstb->mgr->qlock); | |
856 | ||
857 | if (wake_tx) | |
858 | wake_up(&mstb->mgr->tx_waitq); | |
91a25e46 ML |
859 | |
860 | kref_put(kref, drm_dp_free_mst_branch_device); | |
ad7f8a1f DA |
861 | } |
862 | ||
863 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) | |
864 | { | |
865 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); | |
866 | } | |
867 | ||
868 | ||
869 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) | |
870 | { | |
0391359d DV |
871 | struct drm_dp_mst_branch *mstb; |
872 | ||
ad7f8a1f DA |
873 | switch (old_pdt) { |
874 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
875 | case DP_PEER_DEVICE_SST_SINK: | |
876 | /* remove i2c over sideband */ | |
877 | drm_dp_mst_unregister_i2c_bus(&port->aux); | |
878 | break; | |
879 | case DP_PEER_DEVICE_MST_BRANCHING: | |
0391359d | 880 | mstb = port->mstb; |
ad7f8a1f | 881 | port->mstb = NULL; |
0391359d | 882 | drm_dp_put_mst_branch_device(mstb); |
ad7f8a1f DA |
883 | break; |
884 | } | |
885 | } | |
886 | ||
887 | static void drm_dp_destroy_port(struct kref *kref) | |
888 | { | |
889 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); | |
890 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
df4839fd | 891 | |
ad7f8a1f DA |
892 | if (!port->input) { |
893 | port->vcpi.num_slots = 0; | |
c6a0aed4 DA |
894 | |
895 | kfree(port->cached_edid); | |
6b8eeca6 | 896 | |
df4839fd DA |
897 | /* |
898 | * The only time we don't have a connector | |
899 | * on an output port is if the connector init | |
900 | * fails. | |
901 | */ | |
6b8eeca6 | 902 | if (port->connector) { |
df4839fd DA |
903 | /* we can't destroy the connector here, as |
904 | * we might be holding the mode_config.mutex | |
905 | * from an EDID retrieval */ | |
906 | ||
6b8eeca6 | 907 | mutex_lock(&mgr->destroy_connector_lock); |
91a25e46 | 908 | kref_get(&port->parent->kref); |
4772ff03 | 909 | list_add(&port->next, &mgr->destroy_connector_list); |
6b8eeca6 DA |
910 | mutex_unlock(&mgr->destroy_connector_lock); |
911 | schedule_work(&mgr->destroy_connector_work); | |
4772ff03 | 912 | return; |
6b8eeca6 | 913 | } |
df4839fd DA |
914 | /* no need to clean up vcpi |
915 | * as if we have no connector we never setup a vcpi */ | |
ad7f8a1f | 916 | drm_dp_port_teardown_pdt(port, port->pdt); |
36e3fa6a | 917 | port->pdt = DP_PEER_DEVICE_NONE; |
ad7f8a1f DA |
918 | } |
919 | kfree(port); | |
ad7f8a1f DA |
920 | } |
921 | ||
922 | static void drm_dp_put_port(struct drm_dp_mst_port *port) | |
923 | { | |
924 | kref_put(&port->kref, drm_dp_destroy_port); | |
925 | } | |
926 | ||
927 | static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find) | |
928 | { | |
929 | struct drm_dp_mst_port *port; | |
930 | struct drm_dp_mst_branch *rmstb; | |
931 | if (to_find == mstb) { | |
932 | kref_get(&mstb->kref); | |
933 | return mstb; | |
934 | } | |
935 | list_for_each_entry(port, &mstb->ports, next) { | |
936 | if (port->mstb) { | |
937 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); | |
938 | if (rmstb) | |
939 | return rmstb; | |
940 | } | |
941 | } | |
942 | return NULL; | |
943 | } | |
944 | ||
945 | static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) | |
946 | { | |
947 | struct drm_dp_mst_branch *rmstb = NULL; | |
948 | mutex_lock(&mgr->lock); | |
949 | if (mgr->mst_primary) | |
950 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); | |
951 | mutex_unlock(&mgr->lock); | |
952 | return rmstb; | |
953 | } | |
954 | ||
955 | static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) | |
956 | { | |
957 | struct drm_dp_mst_port *port, *mport; | |
958 | ||
959 | list_for_each_entry(port, &mstb->ports, next) { | |
960 | if (port == to_find) { | |
961 | kref_get(&port->kref); | |
962 | return port; | |
963 | } | |
964 | if (port->mstb) { | |
965 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); | |
966 | if (mport) | |
967 | return mport; | |
968 | } | |
969 | } | |
970 | return NULL; | |
971 | } | |
972 | ||
973 | static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
974 | { | |
975 | struct drm_dp_mst_port *rport = NULL; | |
976 | mutex_lock(&mgr->lock); | |
977 | if (mgr->mst_primary) | |
978 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); | |
979 | mutex_unlock(&mgr->lock); | |
980 | return rport; | |
981 | } | |
982 | ||
983 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) | |
984 | { | |
985 | struct drm_dp_mst_port *port; | |
986 | ||
987 | list_for_each_entry(port, &mstb->ports, next) { | |
988 | if (port->port_num == port_num) { | |
989 | kref_get(&port->kref); | |
990 | return port; | |
991 | } | |
992 | } | |
993 | ||
994 | return NULL; | |
995 | } | |
996 | ||
997 | /* | |
998 | * calculate a new RAD for this MST branch device | |
999 | * if parent has an LCT of 2 then it has 1 nibble of RAD, | |
1000 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, | |
1001 | */ | |
1002 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, | |
1003 | u8 *rad) | |
1004 | { | |
75af4c8c | 1005 | int parent_lct = port->parent->lct; |
ad7f8a1f | 1006 | int shift = 4; |
75af4c8c ML |
1007 | int idx = (parent_lct - 1) / 2; |
1008 | if (parent_lct > 1) { | |
1009 | memcpy(rad, port->parent->rad, idx + 1); | |
1010 | shift = (parent_lct % 2) ? 4 : 0; | |
ad7f8a1f DA |
1011 | } else |
1012 | rad[0] = 0; | |
1013 | ||
1014 | rad[idx] |= port->port_num << shift; | |
75af4c8c | 1015 | return parent_lct + 1; |
ad7f8a1f DA |
1016 | } |
1017 | ||
1018 | /* | |
1019 | * return sends link address for new mstb | |
1020 | */ | |
1021 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) | |
1022 | { | |
1023 | int ret; | |
1024 | u8 rad[6], lct; | |
1025 | bool send_link = false; | |
1026 | switch (port->pdt) { | |
1027 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
1028 | case DP_PEER_DEVICE_SST_SINK: | |
1029 | /* add i2c over sideband */ | |
1030 | ret = drm_dp_mst_register_i2c_bus(&port->aux); | |
1031 | break; | |
1032 | case DP_PEER_DEVICE_MST_BRANCHING: | |
1033 | lct = drm_dp_calculate_rad(port, rad); | |
1034 | ||
1035 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); | |
1036 | port->mstb->mgr = port->mgr; | |
1037 | port->mstb->port_parent = port; | |
1038 | ||
1039 | send_link = true; | |
1040 | break; | |
1041 | } | |
1042 | return send_link; | |
1043 | } | |
1044 | ||
5e93b820 | 1045 | static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
ad7f8a1f DA |
1046 | { |
1047 | int ret; | |
5e93b820 HW |
1048 | |
1049 | memcpy(mstb->guid, guid, 16); | |
1050 | ||
1051 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { | |
1052 | if (mstb->port_parent) { | |
1053 | ret = drm_dp_send_dpcd_write( | |
1054 | mstb->mgr, | |
1055 | mstb->port_parent, | |
1056 | DP_GUID, | |
1057 | 16, | |
1058 | mstb->guid); | |
1059 | } else { | |
1060 | ||
1061 | ret = drm_dp_dpcd_write( | |
1062 | mstb->mgr->aux, | |
1063 | DP_GUID, | |
1064 | mstb->guid, | |
1065 | 16); | |
ad7f8a1f DA |
1066 | } |
1067 | } | |
1068 | } | |
1069 | ||
1c960876 DA |
1070 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
1071 | int pnum, | |
d87af4d1 RS |
1072 | char *proppath, |
1073 | size_t proppath_size) | |
ad7f8a1f DA |
1074 | { |
1075 | int i; | |
1076 | char temp[8]; | |
d87af4d1 | 1077 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
ad7f8a1f DA |
1078 | for (i = 0; i < (mstb->lct - 1); i++) { |
1079 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 1080 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
d87af4d1 RS |
1081 | snprintf(temp, sizeof(temp), "-%d", port_num); |
1082 | strlcat(proppath, temp, proppath_size); | |
ad7f8a1f | 1083 | } |
1c960876 | 1084 | snprintf(temp, sizeof(temp), "-%d", pnum); |
d87af4d1 | 1085 | strlcat(proppath, temp, proppath_size); |
ad7f8a1f DA |
1086 | } |
1087 | ||
1088 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, | |
1089 | struct device *dev, | |
1090 | struct drm_dp_link_addr_reply_port *port_msg) | |
1091 | { | |
1092 | struct drm_dp_mst_port *port; | |
1093 | bool ret; | |
1094 | bool created = false; | |
1095 | int old_pdt = 0; | |
1096 | int old_ddps = 0; | |
1097 | port = drm_dp_get_port(mstb, port_msg->port_number); | |
1098 | if (!port) { | |
1099 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
1100 | if (!port) | |
1101 | return; | |
1102 | kref_init(&port->kref); | |
1103 | port->parent = mstb; | |
1104 | port->port_num = port_msg->port_number; | |
1105 | port->mgr = mstb->mgr; | |
1106 | port->aux.name = "DPMST"; | |
1107 | port->aux.dev = dev; | |
1108 | created = true; | |
1109 | } else { | |
1110 | old_pdt = port->pdt; | |
1111 | old_ddps = port->ddps; | |
1112 | } | |
1113 | ||
1114 | port->pdt = port_msg->peer_device_type; | |
1115 | port->input = port_msg->input_port; | |
1116 | port->mcs = port_msg->mcs; | |
1117 | port->ddps = port_msg->ddps; | |
1118 | port->ldps = port_msg->legacy_device_plug_status; | |
1119 | port->dpcd_rev = port_msg->dpcd_revision; | |
1120 | port->num_sdp_streams = port_msg->num_sdp_streams; | |
1121 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; | |
ad7f8a1f DA |
1122 | |
1123 | /* manage mstb port lists with mgr lock - take a reference | |
1124 | for this list */ | |
1125 | if (created) { | |
1126 | mutex_lock(&mstb->mgr->lock); | |
1127 | kref_get(&port->kref); | |
1128 | list_add(&port->next, &mstb->ports); | |
1129 | mutex_unlock(&mstb->mgr->lock); | |
1130 | } | |
1131 | ||
1132 | if (old_ddps != port->ddps) { | |
1133 | if (port->ddps) { | |
ad7f8a1f DA |
1134 | if (!port->input) |
1135 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); | |
1136 | } else { | |
ad7f8a1f DA |
1137 | port->available_pbn = 0; |
1138 | } | |
1139 | } | |
1140 | ||
1141 | if (old_pdt != port->pdt && !port->input) { | |
1142 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1143 | ||
1144 | ret = drm_dp_port_setup_pdt(port); | |
68d8c9fc | 1145 | if (ret == true) |
ad7f8a1f | 1146 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
ad7f8a1f DA |
1147 | } |
1148 | ||
1149 | if (created && !port->input) { | |
1150 | char proppath[255]; | |
1c960876 DA |
1151 | |
1152 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); | |
ad7f8a1f | 1153 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); |
df4839fd DA |
1154 | if (!port->connector) { |
1155 | /* remove it from the port list */ | |
1156 | mutex_lock(&mstb->mgr->lock); | |
1157 | list_del(&port->next); | |
1158 | mutex_unlock(&mstb->mgr->lock); | |
1159 | /* drop port list reference */ | |
1160 | drm_dp_put_port(port); | |
1161 | goto out; | |
1162 | } | |
4da5caa6 VS |
1163 | if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || |
1164 | port->pdt == DP_PEER_DEVICE_SST_SINK) && | |
1165 | port->port_num >= DP_MST_LOGICAL_PORT_0) { | |
8ae22cb4 DA |
1166 | port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); |
1167 | drm_mode_connector_set_tile_property(port->connector); | |
1168 | } | |
d9515c5e | 1169 | (*mstb->mgr->cbs->register_connector)(port->connector); |
ad7f8a1f | 1170 | } |
8ae22cb4 | 1171 | |
df4839fd | 1172 | out: |
ad7f8a1f DA |
1173 | /* put reference to this port */ |
1174 | drm_dp_put_port(port); | |
1175 | } | |
1176 | ||
1177 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, | |
1178 | struct drm_dp_connection_status_notify *conn_stat) | |
1179 | { | |
1180 | struct drm_dp_mst_port *port; | |
1181 | int old_pdt; | |
1182 | int old_ddps; | |
1183 | bool dowork = false; | |
1184 | port = drm_dp_get_port(mstb, conn_stat->port_number); | |
1185 | if (!port) | |
1186 | return; | |
1187 | ||
1188 | old_ddps = port->ddps; | |
1189 | old_pdt = port->pdt; | |
1190 | port->pdt = conn_stat->peer_device_type; | |
1191 | port->mcs = conn_stat->message_capability_status; | |
1192 | port->ldps = conn_stat->legacy_device_plug_status; | |
1193 | port->ddps = conn_stat->displayport_device_plug_status; | |
1194 | ||
1195 | if (old_ddps != port->ddps) { | |
1196 | if (port->ddps) { | |
8ae22cb4 | 1197 | dowork = true; |
ad7f8a1f | 1198 | } else { |
ad7f8a1f DA |
1199 | port->available_pbn = 0; |
1200 | } | |
1201 | } | |
1202 | if (old_pdt != port->pdt && !port->input) { | |
1203 | drm_dp_port_teardown_pdt(port, old_pdt); | |
1204 | ||
1205 | if (drm_dp_port_setup_pdt(port)) | |
1206 | dowork = true; | |
1207 | } | |
1208 | ||
1209 | drm_dp_put_port(port); | |
1210 | if (dowork) | |
1211 | queue_work(system_long_wq, &mstb->mgr->work); | |
1212 | ||
1213 | } | |
1214 | ||
1215 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, | |
1216 | u8 lct, u8 *rad) | |
1217 | { | |
1218 | struct drm_dp_mst_branch *mstb; | |
1219 | struct drm_dp_mst_port *port; | |
1220 | int i; | |
1221 | /* find the port by iterating down */ | |
9eb1e57f DA |
1222 | |
1223 | mutex_lock(&mgr->lock); | |
ad7f8a1f DA |
1224 | mstb = mgr->mst_primary; |
1225 | ||
1226 | for (i = 0; i < lct - 1; i++) { | |
1227 | int shift = (i % 2) ? 0 : 4; | |
7a11a334 | 1228 | int port_num = (rad[i / 2] >> shift) & 0xf; |
ad7f8a1f DA |
1229 | |
1230 | list_for_each_entry(port, &mstb->ports, next) { | |
1231 | if (port->port_num == port_num) { | |
30730c7f AR |
1232 | mstb = port->mstb; |
1233 | if (!mstb) { | |
ad7f8a1f | 1234 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
30730c7f | 1235 | goto out; |
ad7f8a1f DA |
1236 | } |
1237 | ||
ad7f8a1f DA |
1238 | break; |
1239 | } | |
1240 | } | |
1241 | } | |
1242 | kref_get(&mstb->kref); | |
30730c7f | 1243 | out: |
9eb1e57f | 1244 | mutex_unlock(&mgr->lock); |
ad7f8a1f DA |
1245 | return mstb; |
1246 | } | |
1247 | ||
bd934320 ML |
1248 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
1249 | struct drm_dp_mst_branch *mstb, | |
1250 | uint8_t *guid) | |
1251 | { | |
1252 | struct drm_dp_mst_branch *found_mstb; | |
1253 | struct drm_dp_mst_port *port; | |
1254 | ||
5e93b820 HW |
1255 | if (memcmp(mstb->guid, guid, 16) == 0) |
1256 | return mstb; | |
1257 | ||
1258 | ||
bd934320 ML |
1259 | list_for_each_entry(port, &mstb->ports, next) { |
1260 | if (!port->mstb) | |
1261 | continue; | |
1262 | ||
bd934320 ML |
1263 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
1264 | ||
1265 | if (found_mstb) | |
1266 | return found_mstb; | |
1267 | } | |
1268 | ||
1269 | return NULL; | |
1270 | } | |
1271 | ||
1272 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( | |
1273 | struct drm_dp_mst_topology_mgr *mgr, | |
1274 | uint8_t *guid) | |
1275 | { | |
1276 | struct drm_dp_mst_branch *mstb; | |
1277 | ||
1278 | /* find the port by iterating down */ | |
1279 | mutex_lock(&mgr->lock); | |
1280 | ||
5e93b820 | 1281 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
bd934320 ML |
1282 | |
1283 | if (mstb) | |
1284 | kref_get(&mstb->kref); | |
1285 | ||
1286 | mutex_unlock(&mgr->lock); | |
1287 | return mstb; | |
1288 | } | |
1289 | ||
ad7f8a1f DA |
1290 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1291 | struct drm_dp_mst_branch *mstb) | |
1292 | { | |
1293 | struct drm_dp_mst_port *port; | |
9254ec49 | 1294 | struct drm_dp_mst_branch *mstb_child; |
68d8c9fc | 1295 | if (!mstb->link_address_sent) |
ad7f8a1f | 1296 | drm_dp_send_link_address(mgr, mstb); |
68d8c9fc | 1297 | |
ad7f8a1f DA |
1298 | list_for_each_entry(port, &mstb->ports, next) { |
1299 | if (port->input) | |
1300 | continue; | |
1301 | ||
8ae22cb4 | 1302 | if (!port->ddps) |
ad7f8a1f DA |
1303 | continue; |
1304 | ||
1305 | if (!port->available_pbn) | |
1306 | drm_dp_send_enum_path_resources(mgr, mstb, port); | |
1307 | ||
9254ec49 DV |
1308 | if (port->mstb) { |
1309 | mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); | |
1310 | if (mstb_child) { | |
1311 | drm_dp_check_and_send_link_address(mgr, mstb_child); | |
1312 | drm_dp_put_mst_branch_device(mstb_child); | |
1313 | } | |
1314 | } | |
ad7f8a1f DA |
1315 | } |
1316 | } | |
1317 | ||
1318 | static void drm_dp_mst_link_probe_work(struct work_struct *work) | |
1319 | { | |
1320 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); | |
9254ec49 | 1321 | struct drm_dp_mst_branch *mstb; |
ad7f8a1f | 1322 | |
9254ec49 DV |
1323 | mutex_lock(&mgr->lock); |
1324 | mstb = mgr->mst_primary; | |
1325 | if (mstb) { | |
1326 | kref_get(&mstb->kref); | |
1327 | } | |
1328 | mutex_unlock(&mgr->lock); | |
1329 | if (mstb) { | |
1330 | drm_dp_check_and_send_link_address(mgr, mstb); | |
1331 | drm_dp_put_mst_branch_device(mstb); | |
1332 | } | |
ad7f8a1f DA |
1333 | } |
1334 | ||
1335 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, | |
1336 | u8 *guid) | |
1337 | { | |
1338 | static u8 zero_guid[16]; | |
1339 | ||
1340 | if (!memcmp(guid, zero_guid, 16)) { | |
1341 | u64 salt = get_jiffies_64(); | |
1342 | memcpy(&guid[0], &salt, sizeof(u64)); | |
1343 | memcpy(&guid[8], &salt, sizeof(u64)); | |
1344 | return false; | |
1345 | } | |
1346 | return true; | |
1347 | } | |
1348 | ||
1349 | #if 0 | |
1350 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) | |
1351 | { | |
1352 | struct drm_dp_sideband_msg_req_body req; | |
1353 | ||
1354 | req.req_type = DP_REMOTE_DPCD_READ; | |
1355 | req.u.dpcd_read.port_number = port_num; | |
1356 | req.u.dpcd_read.dpcd_address = offset; | |
1357 | req.u.dpcd_read.num_bytes = num_bytes; | |
1358 | drm_dp_encode_sideband_req(&req, msg); | |
1359 | ||
1360 | return 0; | |
1361 | } | |
1362 | #endif | |
1363 | ||
1364 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, | |
1365 | bool up, u8 *msg, int len) | |
1366 | { | |
1367 | int ret; | |
1368 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; | |
1369 | int tosend, total, offset; | |
1370 | int retries = 0; | |
1371 | ||
1372 | retry: | |
1373 | total = len; | |
1374 | offset = 0; | |
1375 | do { | |
1376 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); | |
1377 | ||
1378 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, | |
1379 | &msg[offset], | |
1380 | tosend); | |
1381 | if (ret != tosend) { | |
1382 | if (ret == -EIO && retries < 5) { | |
1383 | retries++; | |
1384 | goto retry; | |
1385 | } | |
1386 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); | |
ad7f8a1f DA |
1387 | |
1388 | return -EIO; | |
1389 | } | |
1390 | offset += tosend; | |
1391 | total -= tosend; | |
1392 | } while (total > 0); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, | |
1397 | struct drm_dp_sideband_msg_tx *txmsg) | |
1398 | { | |
1399 | struct drm_dp_mst_branch *mstb = txmsg->dst; | |
bd934320 | 1400 | u8 req_type; |
ad7f8a1f DA |
1401 | |
1402 | /* both msg slots are full */ | |
1403 | if (txmsg->seqno == -1) { | |
1404 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { | |
1405 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); | |
1406 | return -EAGAIN; | |
1407 | } | |
1408 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { | |
1409 | txmsg->seqno = mstb->last_seqno; | |
1410 | mstb->last_seqno ^= 1; | |
1411 | } else if (mstb->tx_slots[0] == NULL) | |
1412 | txmsg->seqno = 0; | |
1413 | else | |
1414 | txmsg->seqno = 1; | |
1415 | mstb->tx_slots[txmsg->seqno] = txmsg; | |
1416 | } | |
bd934320 ML |
1417 | |
1418 | req_type = txmsg->msg[0] & 0x7f; | |
1419 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || | |
1420 | req_type == DP_RESOURCE_STATUS_NOTIFY) | |
1421 | hdr->broadcast = 1; | |
1422 | else | |
1423 | hdr->broadcast = 0; | |
ad7f8a1f DA |
1424 | hdr->path_msg = txmsg->path_msg; |
1425 | hdr->lct = mstb->lct; | |
1426 | hdr->lcr = mstb->lct - 1; | |
1427 | if (mstb->lct > 1) | |
1428 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); | |
1429 | hdr->seqno = txmsg->seqno; | |
1430 | return 0; | |
1431 | } | |
1432 | /* | |
1433 | * process a single block of the next message in the sideband queue | |
1434 | */ | |
1435 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, | |
1436 | struct drm_dp_sideband_msg_tx *txmsg, | |
1437 | bool up) | |
1438 | { | |
1439 | u8 chunk[48]; | |
1440 | struct drm_dp_sideband_msg_hdr hdr; | |
1441 | int len, space, idx, tosend; | |
1442 | int ret; | |
1443 | ||
bf3719c0 DL |
1444 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
1445 | ||
ad7f8a1f DA |
1446 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
1447 | txmsg->seqno = -1; | |
1448 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; | |
1449 | } | |
1450 | ||
1451 | /* make hdr from dst mst - for replies use seqno | |
1452 | otherwise assign one */ | |
1453 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); | |
1454 | if (ret < 0) | |
1455 | return ret; | |
1456 | ||
1457 | /* amount left to send in this message */ | |
1458 | len = txmsg->cur_len - txmsg->cur_offset; | |
1459 | ||
1460 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ | |
1461 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); | |
1462 | ||
1463 | tosend = min(len, space); | |
1464 | if (len == txmsg->cur_len) | |
1465 | hdr.somt = 1; | |
1466 | if (space >= len) | |
1467 | hdr.eomt = 1; | |
1468 | ||
1469 | ||
1470 | hdr.msg_len = tosend + 1; | |
1471 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); | |
1472 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); | |
1473 | /* add crc at end */ | |
1474 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); | |
1475 | idx += tosend + 1; | |
1476 | ||
1477 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); | |
1478 | if (ret) { | |
1479 | DRM_DEBUG_KMS("sideband msg failed to send\n"); | |
1480 | return ret; | |
1481 | } | |
1482 | ||
1483 | txmsg->cur_offset += tosend; | |
1484 | if (txmsg->cur_offset == txmsg->cur_len) { | |
1485 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; | |
1486 | return 1; | |
1487 | } | |
1488 | return 0; | |
1489 | } | |
1490 | ||
ad7f8a1f DA |
1491 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
1492 | { | |
1493 | struct drm_dp_sideband_msg_tx *txmsg; | |
1494 | int ret; | |
1495 | ||
cd961bb9 DV |
1496 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
1497 | ||
ad7f8a1f | 1498 | /* construct a chunk from the first msg in the tx_msg queue */ |
cb021a3e | 1499 | if (list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f | 1500 | return; |
ad7f8a1f DA |
1501 | |
1502 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); | |
1503 | ret = process_single_tx_qlock(mgr, txmsg, false); | |
1504 | if (ret == 1) { | |
1505 | /* txmsg is sent it should be in the slots now */ | |
1506 | list_del(&txmsg->next); | |
1507 | } else if (ret) { | |
1508 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); | |
1509 | list_del(&txmsg->next); | |
1510 | if (txmsg->seqno != -1) | |
1511 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
1512 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; | |
1513 | wake_up(&mgr->tx_waitq); | |
1514 | } | |
ad7f8a1f DA |
1515 | } |
1516 | ||
1517 | /* called holding qlock */ | |
1f16ee7f ML |
1518 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
1519 | struct drm_dp_sideband_msg_tx *txmsg) | |
ad7f8a1f | 1520 | { |
ad7f8a1f DA |
1521 | int ret; |
1522 | ||
1523 | /* construct a chunk from the first msg in the tx_msg queue */ | |
ad7f8a1f | 1524 | ret = process_single_tx_qlock(mgr, txmsg, true); |
1f16ee7f ML |
1525 | |
1526 | if (ret != 1) | |
ad7f8a1f | 1527 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
1f16ee7f ML |
1528 | |
1529 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; | |
ad7f8a1f DA |
1530 | } |
1531 | ||
1532 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, | |
1533 | struct drm_dp_sideband_msg_tx *txmsg) | |
1534 | { | |
1535 | mutex_lock(&mgr->qlock); | |
1536 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); | |
cb021a3e | 1537 | if (list_is_singular(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
1538 | process_single_down_tx_qlock(mgr); |
1539 | mutex_unlock(&mgr->qlock); | |
1540 | } | |
1541 | ||
68d8c9fc DA |
1542 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
1543 | struct drm_dp_mst_branch *mstb) | |
ad7f8a1f DA |
1544 | { |
1545 | int len; | |
1546 | struct drm_dp_sideband_msg_tx *txmsg; | |
1547 | int ret; | |
1548 | ||
1549 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1550 | if (!txmsg) | |
68d8c9fc | 1551 | return; |
ad7f8a1f DA |
1552 | |
1553 | txmsg->dst = mstb; | |
1554 | len = build_link_address(txmsg); | |
1555 | ||
68d8c9fc | 1556 | mstb->link_address_sent = true; |
ad7f8a1f DA |
1557 | drm_dp_queue_down_tx(mgr, txmsg); |
1558 | ||
1559 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1560 | if (ret > 0) { | |
1561 | int i; | |
1562 | ||
1563 | if (txmsg->reply.reply_type == 1) | |
1564 | DRM_DEBUG_KMS("link address nak received\n"); | |
1565 | else { | |
1566 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); | |
1567 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { | |
1568 | DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, | |
1569 | txmsg->reply.u.link_addr.ports[i].input_port, | |
1570 | txmsg->reply.u.link_addr.ports[i].peer_device_type, | |
1571 | txmsg->reply.u.link_addr.ports[i].port_number, | |
1572 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, | |
1573 | txmsg->reply.u.link_addr.ports[i].mcs, | |
1574 | txmsg->reply.u.link_addr.ports[i].ddps, | |
1575 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, | |
1576 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, | |
1577 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); | |
1578 | } | |
5e93b820 HW |
1579 | |
1580 | drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); | |
1581 | ||
ad7f8a1f DA |
1582 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
1583 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); | |
1584 | } | |
8ae22cb4 | 1585 | (*mgr->cbs->hotplug)(mgr); |
ad7f8a1f | 1586 | } |
68d8c9fc DA |
1587 | } else { |
1588 | mstb->link_address_sent = false; | |
ad7f8a1f | 1589 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
68d8c9fc | 1590 | } |
ad7f8a1f DA |
1591 | |
1592 | kfree(txmsg); | |
ad7f8a1f DA |
1593 | } |
1594 | ||
1595 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, | |
1596 | struct drm_dp_mst_branch *mstb, | |
1597 | struct drm_dp_mst_port *port) | |
1598 | { | |
1599 | int len; | |
1600 | struct drm_dp_sideband_msg_tx *txmsg; | |
1601 | int ret; | |
1602 | ||
1603 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1604 | if (!txmsg) | |
1605 | return -ENOMEM; | |
1606 | ||
1607 | txmsg->dst = mstb; | |
1608 | len = build_enum_path_resources(txmsg, port->port_num); | |
1609 | ||
1610 | drm_dp_queue_down_tx(mgr, txmsg); | |
1611 | ||
1612 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1613 | if (ret > 0) { | |
1614 | if (txmsg->reply.reply_type == 1) | |
1615 | DRM_DEBUG_KMS("enum path resources nak received\n"); | |
1616 | else { | |
1617 | if (port->port_num != txmsg->reply.u.path_resources.port_number) | |
1618 | DRM_ERROR("got incorrect port in response\n"); | |
1619 | DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, | |
1620 | txmsg->reply.u.path_resources.avail_payload_bw_number); | |
1621 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; | |
1622 | } | |
1623 | } | |
1624 | ||
1625 | kfree(txmsg); | |
1626 | return 0; | |
1627 | } | |
1628 | ||
91a25e46 ML |
1629 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
1630 | { | |
1631 | if (!mstb->port_parent) | |
1632 | return NULL; | |
1633 | ||
1634 | if (mstb->port_parent->mstb != mstb) | |
1635 | return mstb->port_parent; | |
1636 | ||
1637 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); | |
1638 | } | |
1639 | ||
1640 | static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, | |
1641 | struct drm_dp_mst_branch *mstb, | |
1642 | int *port_num) | |
1643 | { | |
1644 | struct drm_dp_mst_branch *rmstb = NULL; | |
1645 | struct drm_dp_mst_port *found_port; | |
1646 | mutex_lock(&mgr->lock); | |
1647 | if (mgr->mst_primary) { | |
1648 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); | |
1649 | ||
1650 | if (found_port) { | |
1651 | rmstb = found_port->parent; | |
1652 | kref_get(&rmstb->kref); | |
1653 | *port_num = found_port->port_num; | |
1654 | } | |
1655 | } | |
1656 | mutex_unlock(&mgr->lock); | |
1657 | return rmstb; | |
1658 | } | |
1659 | ||
8fa6a425 TR |
1660 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
1661 | struct drm_dp_mst_port *port, | |
1662 | int id, | |
1663 | int pbn) | |
ad7f8a1f DA |
1664 | { |
1665 | struct drm_dp_sideband_msg_tx *txmsg; | |
1666 | struct drm_dp_mst_branch *mstb; | |
91a25e46 | 1667 | int len, ret, port_num; |
ef8f9bea LY |
1668 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
1669 | int i; | |
ad7f8a1f | 1670 | |
deba0a2a | 1671 | port = drm_dp_get_validated_port_ref(mgr, port); |
1672 | if (!port) | |
1673 | return -EINVAL; | |
1674 | ||
91a25e46 | 1675 | port_num = port->port_num; |
ad7f8a1f | 1676 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
91a25e46 ML |
1677 | if (!mstb) { |
1678 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); | |
1679 | ||
deba0a2a | 1680 | if (!mstb) { |
1681 | drm_dp_put_port(port); | |
91a25e46 | 1682 | return -EINVAL; |
deba0a2a | 1683 | } |
91a25e46 | 1684 | } |
ad7f8a1f DA |
1685 | |
1686 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1687 | if (!txmsg) { | |
1688 | ret = -ENOMEM; | |
1689 | goto fail_put; | |
1690 | } | |
1691 | ||
ef8f9bea LY |
1692 | for (i = 0; i < port->num_sdp_streams; i++) |
1693 | sinks[i] = i; | |
1694 | ||
ad7f8a1f | 1695 | txmsg->dst = mstb; |
91a25e46 | 1696 | len = build_allocate_payload(txmsg, port_num, |
ad7f8a1f | 1697 | id, |
ef8f9bea | 1698 | pbn, port->num_sdp_streams, sinks); |
ad7f8a1f DA |
1699 | |
1700 | drm_dp_queue_down_tx(mgr, txmsg); | |
1701 | ||
1702 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1703 | if (ret > 0) { | |
1704 | if (txmsg->reply.reply_type == 1) { | |
1705 | ret = -EINVAL; | |
1706 | } else | |
1707 | ret = 0; | |
1708 | } | |
1709 | kfree(txmsg); | |
1710 | fail_put: | |
1711 | drm_dp_put_mst_branch_device(mstb); | |
deba0a2a | 1712 | drm_dp_put_port(port); |
ad7f8a1f DA |
1713 | return ret; |
1714 | } | |
1715 | ||
1716 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, | |
1717 | int id, | |
1718 | struct drm_dp_payload *payload) | |
1719 | { | |
1720 | int ret; | |
1721 | ||
1722 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); | |
1723 | if (ret < 0) { | |
1724 | payload->payload_state = 0; | |
1725 | return ret; | |
1726 | } | |
1727 | payload->payload_state = DP_PAYLOAD_LOCAL; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
8fa6a425 TR |
1731 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
1732 | struct drm_dp_mst_port *port, | |
1733 | int id, | |
1734 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1735 | { |
1736 | int ret; | |
1737 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); | |
1738 | if (ret < 0) | |
1739 | return ret; | |
1740 | payload->payload_state = DP_PAYLOAD_REMOTE; | |
1741 | return ret; | |
1742 | } | |
1743 | ||
8fa6a425 TR |
1744 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
1745 | struct drm_dp_mst_port *port, | |
1746 | int id, | |
1747 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1748 | { |
1749 | DRM_DEBUG_KMS("\n"); | |
1750 | /* its okay for these to fail */ | |
1751 | if (port) { | |
1752 | drm_dp_payload_send_msg(mgr, port, id, 0); | |
1753 | } | |
1754 | ||
1755 | drm_dp_dpcd_write_payload(mgr, id, payload); | |
dfda0df3 | 1756 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
ad7f8a1f DA |
1757 | return 0; |
1758 | } | |
1759 | ||
8fa6a425 TR |
1760 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
1761 | int id, | |
1762 | struct drm_dp_payload *payload) | |
ad7f8a1f DA |
1763 | { |
1764 | payload->payload_state = 0; | |
1765 | return 0; | |
1766 | } | |
1767 | ||
1768 | /** | |
1769 | * drm_dp_update_payload_part1() - Execute payload update part 1 | |
1770 | * @mgr: manager to use. | |
1771 | * | |
1772 | * This iterates over all proposed virtual channels, and tries to | |
1773 | * allocate space in the link for them. For 0->slots transitions, | |
1774 | * this step just writes the VCPI to the MST device. For slots->0 | |
1775 | * transitions, this writes the updated VCPIs and removes the | |
1776 | * remote VC payloads. | |
1777 | * | |
1778 | * after calling this the driver should generate ACT and payload | |
1779 | * packets. | |
1780 | */ | |
1781 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) | |
1782 | { | |
dfda0df3 | 1783 | int i, j; |
ad7f8a1f DA |
1784 | int cur_slots = 1; |
1785 | struct drm_dp_payload req_payload; | |
1786 | struct drm_dp_mst_port *port; | |
1787 | ||
1788 | mutex_lock(&mgr->payload_lock); | |
1789 | for (i = 0; i < mgr->max_payloads; i++) { | |
1790 | /* solve the current payloads - compare to the hw ones | |
1791 | - update the hw view */ | |
1792 | req_payload.start_slot = cur_slots; | |
1793 | if (mgr->proposed_vcpis[i]) { | |
1794 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
263efde3 | 1795 | port = drm_dp_get_validated_port_ref(mgr, port); |
1796 | if (!port) { | |
1797 | mutex_unlock(&mgr->payload_lock); | |
1798 | return -EINVAL; | |
1799 | } | |
ad7f8a1f | 1800 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; |
6cecdf7a | 1801 | req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; |
ad7f8a1f DA |
1802 | } else { |
1803 | port = NULL; | |
1804 | req_payload.num_slots = 0; | |
1805 | } | |
dfda0df3 DA |
1806 | |
1807 | if (mgr->payloads[i].start_slot != req_payload.start_slot) { | |
1808 | mgr->payloads[i].start_slot = req_payload.start_slot; | |
1809 | } | |
ad7f8a1f | 1810 | /* work out what is required to happen with this payload */ |
dfda0df3 | 1811 | if (mgr->payloads[i].num_slots != req_payload.num_slots) { |
ad7f8a1f DA |
1812 | |
1813 | /* need to push an update for this payload */ | |
1814 | if (req_payload.num_slots) { | |
dfda0df3 | 1815 | drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); |
ad7f8a1f | 1816 | mgr->payloads[i].num_slots = req_payload.num_slots; |
6cecdf7a | 1817 | mgr->payloads[i].vcpi = req_payload.vcpi; |
ad7f8a1f DA |
1818 | } else if (mgr->payloads[i].num_slots) { |
1819 | mgr->payloads[i].num_slots = 0; | |
dfda0df3 | 1820 | drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]); |
ad7f8a1f | 1821 | req_payload.payload_state = mgr->payloads[i].payload_state; |
dfda0df3 DA |
1822 | mgr->payloads[i].start_slot = 0; |
1823 | } | |
ad7f8a1f DA |
1824 | mgr->payloads[i].payload_state = req_payload.payload_state; |
1825 | } | |
1826 | cur_slots += req_payload.num_slots; | |
263efde3 | 1827 | |
1828 | if (port) | |
1829 | drm_dp_put_port(port); | |
ad7f8a1f | 1830 | } |
dfda0df3 DA |
1831 | |
1832 | for (i = 0; i < mgr->max_payloads; i++) { | |
1833 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { | |
1834 | DRM_DEBUG_KMS("removing payload %d\n", i); | |
1835 | for (j = i; j < mgr->max_payloads - 1; j++) { | |
1836 | memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); | |
1837 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; | |
1838 | if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { | |
1839 | set_bit(j + 1, &mgr->payload_mask); | |
1840 | } else { | |
1841 | clear_bit(j + 1, &mgr->payload_mask); | |
1842 | } | |
1843 | } | |
1844 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); | |
1845 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; | |
1846 | clear_bit(mgr->max_payloads, &mgr->payload_mask); | |
1847 | ||
1848 | } | |
1849 | } | |
ad7f8a1f DA |
1850 | mutex_unlock(&mgr->payload_lock); |
1851 | ||
1852 | return 0; | |
1853 | } | |
1854 | EXPORT_SYMBOL(drm_dp_update_payload_part1); | |
1855 | ||
1856 | /** | |
1857 | * drm_dp_update_payload_part2() - Execute payload update part 2 | |
1858 | * @mgr: manager to use. | |
1859 | * | |
1860 | * This iterates over all proposed virtual channels, and tries to | |
1861 | * allocate space in the link for them. For 0->slots transitions, | |
1862 | * this step writes the remote VC payload commands. For slots->0 | |
1863 | * this just resets some internal state. | |
1864 | */ | |
1865 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) | |
1866 | { | |
1867 | struct drm_dp_mst_port *port; | |
1868 | int i; | |
7389ad4b | 1869 | int ret = 0; |
ad7f8a1f DA |
1870 | mutex_lock(&mgr->payload_lock); |
1871 | for (i = 0; i < mgr->max_payloads; i++) { | |
1872 | ||
1873 | if (!mgr->proposed_vcpis[i]) | |
1874 | continue; | |
1875 | ||
1876 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); | |
1877 | ||
1878 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); | |
1879 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { | |
dfda0df3 | 1880 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f | 1881 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
dfda0df3 | 1882 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
ad7f8a1f DA |
1883 | } |
1884 | if (ret) { | |
1885 | mutex_unlock(&mgr->payload_lock); | |
1886 | return ret; | |
1887 | } | |
1888 | } | |
1889 | mutex_unlock(&mgr->payload_lock); | |
1890 | return 0; | |
1891 | } | |
1892 | EXPORT_SYMBOL(drm_dp_update_payload_part2); | |
1893 | ||
1894 | #if 0 /* unused as of yet */ | |
1895 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, | |
1896 | struct drm_dp_mst_port *port, | |
1897 | int offset, int size) | |
1898 | { | |
1899 | int len; | |
1900 | struct drm_dp_sideband_msg_tx *txmsg; | |
1901 | ||
1902 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1903 | if (!txmsg) | |
1904 | return -ENOMEM; | |
1905 | ||
1906 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); | |
1907 | txmsg->dst = port->parent; | |
1908 | ||
1909 | drm_dp_queue_down_tx(mgr, txmsg); | |
1910 | ||
1911 | return 0; | |
1912 | } | |
1913 | #endif | |
1914 | ||
1915 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, | |
1916 | struct drm_dp_mst_port *port, | |
1917 | int offset, int size, u8 *bytes) | |
1918 | { | |
1919 | int len; | |
1920 | int ret; | |
1921 | struct drm_dp_sideband_msg_tx *txmsg; | |
1922 | struct drm_dp_mst_branch *mstb; | |
1923 | ||
1924 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
1925 | if (!mstb) | |
1926 | return -EINVAL; | |
1927 | ||
1928 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1929 | if (!txmsg) { | |
1930 | ret = -ENOMEM; | |
1931 | goto fail_put; | |
1932 | } | |
1933 | ||
1934 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); | |
1935 | txmsg->dst = mstb; | |
1936 | ||
1937 | drm_dp_queue_down_tx(mgr, txmsg); | |
1938 | ||
1939 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
1940 | if (ret > 0) { | |
1941 | if (txmsg->reply.reply_type == 1) { | |
1942 | ret = -EINVAL; | |
1943 | } else | |
1944 | ret = 0; | |
1945 | } | |
1946 | kfree(txmsg); | |
1947 | fail_put: | |
1948 | drm_dp_put_mst_branch_device(mstb); | |
1949 | return ret; | |
1950 | } | |
1951 | ||
1952 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) | |
1953 | { | |
1954 | struct drm_dp_sideband_msg_reply_body reply; | |
1955 | ||
a68d2437 | 1956 | reply.reply_type = 0; |
ad7f8a1f DA |
1957 | reply.req_type = req_type; |
1958 | drm_dp_encode_sideband_reply(&reply, msg); | |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, | |
1963 | struct drm_dp_mst_branch *mstb, | |
1964 | int req_type, int seqno, bool broadcast) | |
1965 | { | |
1966 | struct drm_dp_sideband_msg_tx *txmsg; | |
1967 | ||
1968 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
1969 | if (!txmsg) | |
1970 | return -ENOMEM; | |
1971 | ||
1972 | txmsg->dst = mstb; | |
1973 | txmsg->seqno = seqno; | |
1974 | drm_dp_encode_up_ack_reply(txmsg, req_type); | |
1975 | ||
1976 | mutex_lock(&mgr->qlock); | |
1f16ee7f ML |
1977 | |
1978 | process_single_up_tx_qlock(mgr, txmsg); | |
1979 | ||
ad7f8a1f | 1980 | mutex_unlock(&mgr->qlock); |
1f16ee7f ML |
1981 | |
1982 | kfree(txmsg); | |
ad7f8a1f DA |
1983 | return 0; |
1984 | } | |
1985 | ||
b853fdb3 CW |
1986 | static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
1987 | int dp_link_count, | |
1988 | int *out) | |
ad7f8a1f DA |
1989 | { |
1990 | switch (dp_link_bw) { | |
b853fdb3 CW |
1991 | default: |
1992 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", | |
1993 | dp_link_bw, dp_link_count); | |
1994 | return false; | |
1995 | ||
ad7f8a1f | 1996 | case DP_LINK_BW_1_62: |
b853fdb3 CW |
1997 | *out = 3 * dp_link_count; |
1998 | break; | |
ad7f8a1f | 1999 | case DP_LINK_BW_2_7: |
b853fdb3 CW |
2000 | *out = 5 * dp_link_count; |
2001 | break; | |
ad7f8a1f | 2002 | case DP_LINK_BW_5_4: |
b853fdb3 CW |
2003 | *out = 10 * dp_link_count; |
2004 | break; | |
ad7f8a1f | 2005 | } |
b853fdb3 | 2006 | return true; |
ad7f8a1f DA |
2007 | } |
2008 | ||
2009 | /** | |
2010 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager | |
2011 | * @mgr: manager to set state for | |
2012 | * @mst_state: true to enable MST on this connector - false to disable. | |
2013 | * | |
2014 | * This is called by the driver when it detects an MST capable device plugged | |
2015 | * into a DP MST capable port, or when a DP MST capable device is unplugged. | |
2016 | */ | |
2017 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) | |
2018 | { | |
2019 | int ret = 0; | |
2020 | struct drm_dp_mst_branch *mstb = NULL; | |
2021 | ||
2022 | mutex_lock(&mgr->lock); | |
2023 | if (mst_state == mgr->mst_state) | |
2024 | goto out_unlock; | |
2025 | ||
2026 | mgr->mst_state = mst_state; | |
2027 | /* set the device into MST mode */ | |
2028 | if (mst_state) { | |
2029 | WARN_ON(mgr->mst_primary); | |
2030 | ||
2031 | /* get dpcd info */ | |
2032 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); | |
2033 | if (ret != DP_RECEIVER_CAP_SIZE) { | |
2034 | DRM_DEBUG_KMS("failed to read DPCD\n"); | |
2035 | goto out_unlock; | |
2036 | } | |
2037 | ||
b853fdb3 CW |
2038 | if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
2039 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, | |
2040 | &mgr->pbn_div)) { | |
2041 | ret = -EINVAL; | |
2042 | goto out_unlock; | |
2043 | } | |
2044 | ||
ad7f8a1f DA |
2045 | mgr->total_pbn = 2560; |
2046 | mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); | |
2047 | mgr->avail_slots = mgr->total_slots; | |
2048 | ||
2049 | /* add initial branch device at LCT 1 */ | |
2050 | mstb = drm_dp_add_mst_branch_device(1, NULL); | |
2051 | if (mstb == NULL) { | |
2052 | ret = -ENOMEM; | |
2053 | goto out_unlock; | |
2054 | } | |
2055 | mstb->mgr = mgr; | |
2056 | ||
2057 | /* give this the main reference */ | |
2058 | mgr->mst_primary = mstb; | |
2059 | kref_get(&mgr->mst_primary->kref); | |
2060 | ||
c175cd16 AG |
2061 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
2062 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
2063 | if (ret < 0) { | |
2064 | goto out_unlock; | |
2065 | } | |
2066 | ||
ad7f8a1f DA |
2067 | { |
2068 | struct drm_dp_payload reset_pay; | |
2069 | reset_pay.start_slot = 0; | |
2070 | reset_pay.num_slots = 0x3f; | |
2071 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); | |
2072 | } | |
2073 | ||
ad7f8a1f DA |
2074 | queue_work(system_long_wq, &mgr->work); |
2075 | ||
2076 | ret = 0; | |
2077 | } else { | |
2078 | /* disable MST on the device */ | |
2079 | mstb = mgr->mst_primary; | |
2080 | mgr->mst_primary = NULL; | |
2081 | /* this can fail if the device is gone */ | |
2082 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); | |
2083 | ret = 0; | |
2084 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); | |
2085 | mgr->payload_mask = 0; | |
2086 | set_bit(0, &mgr->payload_mask); | |
dfda0df3 | 2087 | mgr->vcpi_mask = 0; |
ad7f8a1f DA |
2088 | } |
2089 | ||
2090 | out_unlock: | |
2091 | mutex_unlock(&mgr->lock); | |
2092 | if (mstb) | |
2093 | drm_dp_put_mst_branch_device(mstb); | |
2094 | return ret; | |
2095 | ||
2096 | } | |
2097 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); | |
2098 | ||
2099 | /** | |
2100 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager | |
2101 | * @mgr: manager to suspend | |
2102 | * | |
2103 | * This function tells the MST device that we can't handle UP messages | |
2104 | * anymore. This should stop it from sending any since we are suspended. | |
2105 | */ | |
2106 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) | |
2107 | { | |
2108 | mutex_lock(&mgr->lock); | |
2109 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
2110 | DP_MST_EN | DP_UPSTREAM_IS_SRC); | |
2111 | mutex_unlock(&mgr->lock); | |
274d8352 DA |
2112 | flush_work(&mgr->work); |
2113 | flush_work(&mgr->destroy_connector_work); | |
ad7f8a1f DA |
2114 | } |
2115 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); | |
2116 | ||
2117 | /** | |
2118 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager | |
2119 | * @mgr: manager to resume | |
2120 | * | |
2121 | * This will fetch DPCD and see if the device is still there, | |
2122 | * if it is, it will rewrite the MSTM control bits, and return. | |
2123 | * | |
2124 | * if the device fails this returns -1, and the driver should do | |
2125 | * a full MST reprobe, in case we were undocked. | |
2126 | */ | |
2127 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) | |
2128 | { | |
2129 | int ret = 0; | |
2130 | ||
2131 | mutex_lock(&mgr->lock); | |
2132 | ||
2133 | if (mgr->mst_primary) { | |
2134 | int sret; | |
1652fce6 L |
2135 | u8 guid[16]; |
2136 | ||
ad7f8a1f DA |
2137 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
2138 | if (sret != DP_RECEIVER_CAP_SIZE) { | |
2139 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
2140 | ret = -1; | |
2141 | goto out_unlock; | |
2142 | } | |
2143 | ||
2144 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, | |
2145 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); | |
2146 | if (ret < 0) { | |
2147 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); | |
2148 | ret = -1; | |
2149 | goto out_unlock; | |
2150 | } | |
1652fce6 L |
2151 | |
2152 | /* Some hubs forget their guids after they resume */ | |
2153 | sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); | |
2154 | if (sret != 16) { | |
2155 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); | |
2156 | ret = -1; | |
2157 | goto out_unlock; | |
2158 | } | |
2159 | drm_dp_check_mstb_guid(mgr->mst_primary, guid); | |
2160 | ||
ad7f8a1f DA |
2161 | ret = 0; |
2162 | } else | |
2163 | ret = -1; | |
2164 | ||
2165 | out_unlock: | |
2166 | mutex_unlock(&mgr->lock); | |
2167 | return ret; | |
2168 | } | |
2169 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); | |
2170 | ||
2171 | static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) | |
2172 | { | |
2173 | int len; | |
2174 | u8 replyblock[32]; | |
2175 | int replylen, origlen, curreply; | |
2176 | int ret; | |
2177 | struct drm_dp_sideband_msg_rx *msg; | |
2178 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; | |
2179 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; | |
2180 | ||
2181 | len = min(mgr->max_dpcd_transaction_bytes, 16); | |
2182 | ret = drm_dp_dpcd_read(mgr->aux, basereg, | |
2183 | replyblock, len); | |
2184 | if (ret != len) { | |
2185 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); | |
2186 | return; | |
2187 | } | |
2188 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); | |
2189 | if (!ret) { | |
2190 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); | |
2191 | return; | |
2192 | } | |
2193 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; | |
2194 | ||
2195 | origlen = replylen; | |
2196 | replylen -= len; | |
2197 | curreply = len; | |
2198 | while (replylen > 0) { | |
2199 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); | |
2200 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, | |
2201 | replyblock, len); | |
2202 | if (ret != len) { | |
2203 | DRM_DEBUG_KMS("failed to read a chunk\n"); | |
2204 | } | |
2205 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); | |
2206 | if (ret == false) | |
2207 | DRM_DEBUG_KMS("failed to build sideband msg\n"); | |
2208 | curreply += len; | |
2209 | replylen -= len; | |
2210 | } | |
2211 | } | |
2212 | ||
2213 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) | |
2214 | { | |
2215 | int ret = 0; | |
2216 | ||
2217 | drm_dp_get_one_sb_msg(mgr, false); | |
2218 | ||
2219 | if (mgr->down_rep_recv.have_eomt) { | |
2220 | struct drm_dp_sideband_msg_tx *txmsg; | |
2221 | struct drm_dp_mst_branch *mstb; | |
2222 | int slot = -1; | |
2223 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2224 | mgr->down_rep_recv.initial_hdr.lct, | |
2225 | mgr->down_rep_recv.initial_hdr.rad); | |
2226 | ||
2227 | if (!mstb) { | |
2228 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); | |
2229 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | /* find the message */ | |
2234 | slot = mgr->down_rep_recv.initial_hdr.seqno; | |
2235 | mutex_lock(&mgr->qlock); | |
2236 | txmsg = mstb->tx_slots[slot]; | |
2237 | /* remove from slots */ | |
2238 | mutex_unlock(&mgr->qlock); | |
2239 | ||
2240 | if (!txmsg) { | |
2241 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", | |
2242 | mstb, | |
2243 | mgr->down_rep_recv.initial_hdr.seqno, | |
2244 | mgr->down_rep_recv.initial_hdr.lct, | |
2245 | mgr->down_rep_recv.initial_hdr.rad[0], | |
2246 | mgr->down_rep_recv.msg[0]); | |
2247 | drm_dp_put_mst_branch_device(mstb); | |
2248 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2249 | return 0; | |
2250 | } | |
2251 | ||
2252 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); | |
2253 | if (txmsg->reply.reply_type == 1) { | |
2254 | DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); | |
2255 | } | |
2256 | ||
2257 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2258 | drm_dp_put_mst_branch_device(mstb); | |
2259 | ||
2260 | mutex_lock(&mgr->qlock); | |
2261 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; | |
2262 | mstb->tx_slots[slot] = NULL; | |
2263 | mutex_unlock(&mgr->qlock); | |
2264 | ||
2265 | wake_up(&mgr->tx_waitq); | |
2266 | } | |
2267 | return ret; | |
2268 | } | |
2269 | ||
2270 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) | |
2271 | { | |
2272 | int ret = 0; | |
2273 | drm_dp_get_one_sb_msg(mgr, true); | |
2274 | ||
2275 | if (mgr->up_req_recv.have_eomt) { | |
2276 | struct drm_dp_sideband_msg_req_body msg; | |
bd934320 | 2277 | struct drm_dp_mst_branch *mstb = NULL; |
ad7f8a1f | 2278 | bool seqno; |
bd934320 ML |
2279 | |
2280 | if (!mgr->up_req_recv.initial_hdr.broadcast) { | |
2281 | mstb = drm_dp_get_mst_branch_device(mgr, | |
2282 | mgr->up_req_recv.initial_hdr.lct, | |
2283 | mgr->up_req_recv.initial_hdr.rad); | |
2284 | if (!mstb) { | |
2285 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2286 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2287 | return 0; | |
2288 | } | |
ad7f8a1f DA |
2289 | } |
2290 | ||
2291 | seqno = mgr->up_req_recv.initial_hdr.seqno; | |
2292 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); | |
2293 | ||
2294 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { | |
bd934320 ML |
2295 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2296 | ||
2297 | if (!mstb) | |
2298 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); | |
2299 | ||
2300 | if (!mstb) { | |
2301 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2302 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2303 | return 0; | |
2304 | } | |
2305 | ||
ad7f8a1f | 2306 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
5e93b820 | 2307 | |
ad7f8a1f | 2308 | DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); |
8ae22cb4 DA |
2309 | (*mgr->cbs->hotplug)(mgr); |
2310 | ||
ad7f8a1f | 2311 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
bd934320 ML |
2312 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
2313 | if (!mstb) | |
2314 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); | |
2315 | ||
2316 | if (!mstb) { | |
2317 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); | |
2318 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2319 | return 0; | |
2320 | } | |
2321 | ||
ad7f8a1f DA |
2322 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
2323 | } | |
2324 | ||
2325 | drm_dp_put_mst_branch_device(mstb); | |
2326 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); | |
2327 | } | |
2328 | return ret; | |
2329 | } | |
2330 | ||
2331 | /** | |
2332 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify | |
2333 | * @mgr: manager to notify irq for. | |
2334 | * @esi: 4 bytes from SINK_COUNT_ESI | |
295ee853 | 2335 | * @handled: whether the hpd interrupt was consumed or not |
ad7f8a1f DA |
2336 | * |
2337 | * This should be called from the driver when it detects a short IRQ, | |
2338 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The | |
2339 | * topology manager will process the sideband messages received as a result | |
2340 | * of this. | |
2341 | */ | |
2342 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) | |
2343 | { | |
2344 | int ret = 0; | |
2345 | int sc; | |
2346 | *handled = false; | |
2347 | sc = esi[0] & 0x3f; | |
2348 | ||
2349 | if (sc != mgr->sink_count) { | |
2350 | mgr->sink_count = sc; | |
2351 | *handled = true; | |
2352 | } | |
2353 | ||
2354 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { | |
2355 | ret = drm_dp_mst_handle_down_rep(mgr); | |
2356 | *handled = true; | |
2357 | } | |
2358 | ||
2359 | if (esi[1] & DP_UP_REQ_MSG_RDY) { | |
2360 | ret |= drm_dp_mst_handle_up_req(mgr); | |
2361 | *handled = true; | |
2362 | } | |
2363 | ||
2364 | drm_dp_mst_kick_tx(mgr); | |
2365 | return ret; | |
2366 | } | |
2367 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); | |
2368 | ||
2369 | /** | |
2370 | * drm_dp_mst_detect_port() - get connection status for an MST port | |
132d49d7 | 2371 | * @connector: DRM connector for this port |
ad7f8a1f DA |
2372 | * @mgr: manager for this port |
2373 | * @port: unverified pointer to a port | |
2374 | * | |
2375 | * This returns the current connection state for a port. It validates the | |
2376 | * port pointer still exists so the caller doesn't require a reference | |
2377 | */ | |
c6a0aed4 DA |
2378 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, |
2379 | struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
ad7f8a1f DA |
2380 | { |
2381 | enum drm_connector_status status = connector_status_disconnected; | |
2382 | ||
2383 | /* we need to search for the port in the mgr in case its gone */ | |
2384 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2385 | if (!port) | |
2386 | return connector_status_disconnected; | |
2387 | ||
2388 | if (!port->ddps) | |
2389 | goto out; | |
2390 | ||
2391 | switch (port->pdt) { | |
2392 | case DP_PEER_DEVICE_NONE: | |
2393 | case DP_PEER_DEVICE_MST_BRANCHING: | |
2394 | break; | |
2395 | ||
2396 | case DP_PEER_DEVICE_SST_SINK: | |
2397 | status = connector_status_connected; | |
8ae22cb4 DA |
2398 | /* for logical ports - cache the EDID */ |
2399 | if (port->port_num >= 8 && !port->cached_edid) { | |
2400 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); | |
2401 | } | |
ad7f8a1f DA |
2402 | break; |
2403 | case DP_PEER_DEVICE_DP_LEGACY_CONV: | |
2404 | if (port->ldps) | |
2405 | status = connector_status_connected; | |
2406 | break; | |
2407 | } | |
2408 | out: | |
2409 | drm_dp_put_port(port); | |
2410 | return status; | |
2411 | } | |
2412 | EXPORT_SYMBOL(drm_dp_mst_detect_port); | |
2413 | ||
ef8f9bea LY |
2414 | /** |
2415 | * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not | |
2416 | * @mgr: manager for this port | |
2417 | * @port: unverified pointer to a port. | |
2418 | * | |
2419 | * This returns whether the port supports audio or not. | |
2420 | */ | |
2421 | bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, | |
2422 | struct drm_dp_mst_port *port) | |
2423 | { | |
2424 | bool ret = false; | |
2425 | ||
2426 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2427 | if (!port) | |
2428 | return ret; | |
2429 | ret = port->has_audio; | |
2430 | drm_dp_put_port(port); | |
2431 | return ret; | |
2432 | } | |
2433 | EXPORT_SYMBOL(drm_dp_mst_port_has_audio); | |
2434 | ||
ad7f8a1f DA |
2435 | /** |
2436 | * drm_dp_mst_get_edid() - get EDID for an MST port | |
2437 | * @connector: toplevel connector to get EDID for | |
2438 | * @mgr: manager for this port | |
2439 | * @port: unverified pointer to a port. | |
2440 | * | |
2441 | * This returns an EDID for the port connected to a connector, | |
2442 | * It validates the pointer still exists so the caller doesn't require a | |
2443 | * reference. | |
2444 | */ | |
2445 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2446 | { | |
2447 | struct edid *edid = NULL; | |
2448 | ||
2449 | /* we need to search for the port in the mgr in case its gone */ | |
2450 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2451 | if (!port) | |
2452 | return NULL; | |
2453 | ||
c6a0aed4 DA |
2454 | if (port->cached_edid) |
2455 | edid = drm_edid_duplicate(port->cached_edid); | |
8ae22cb4 DA |
2456 | else { |
2457 | edid = drm_get_edid(connector, &port->aux.ddc); | |
2458 | drm_mode_connector_set_tile_property(connector); | |
2459 | } | |
ef8f9bea | 2460 | port->has_audio = drm_detect_monitor_audio(edid); |
ad7f8a1f DA |
2461 | drm_dp_put_port(port); |
2462 | return edid; | |
2463 | } | |
2464 | EXPORT_SYMBOL(drm_dp_mst_get_edid); | |
2465 | ||
2466 | /** | |
2467 | * drm_dp_find_vcpi_slots() - find slots for this PBN value | |
2468 | * @mgr: manager to use | |
2469 | * @pbn: payload bandwidth to convert into slots. | |
2470 | */ | |
2471 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, | |
2472 | int pbn) | |
2473 | { | |
2474 | int num_slots; | |
2475 | ||
2476 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2477 | ||
2478 | if (num_slots > mgr->avail_slots) | |
2479 | return -ENOSPC; | |
2480 | return num_slots; | |
2481 | } | |
2482 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); | |
2483 | ||
2484 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, | |
2485 | struct drm_dp_vcpi *vcpi, int pbn) | |
2486 | { | |
2487 | int num_slots; | |
2488 | int ret; | |
2489 | ||
2490 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); | |
2491 | ||
2492 | if (num_slots > mgr->avail_slots) | |
2493 | return -ENOSPC; | |
2494 | ||
2495 | vcpi->pbn = pbn; | |
2496 | vcpi->aligned_pbn = num_slots * mgr->pbn_div; | |
2497 | vcpi->num_slots = num_slots; | |
2498 | ||
2499 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); | |
2500 | if (ret < 0) | |
2501 | return ret; | |
2502 | return 0; | |
2503 | } | |
2504 | ||
2505 | /** | |
2506 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel | |
2507 | * @mgr: manager for this port | |
2508 | * @port: port to allocate a virtual channel for. | |
2509 | * @pbn: payload bandwidth number to request | |
2510 | * @slots: returned number of slots for this PBN. | |
2511 | */ | |
2512 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) | |
2513 | { | |
2514 | int ret; | |
2515 | ||
2516 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2517 | if (!port) | |
2518 | return false; | |
2519 | ||
2520 | if (port->vcpi.vcpi > 0) { | |
2521 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); | |
2522 | if (pbn == port->vcpi.pbn) { | |
2523 | *slots = port->vcpi.num_slots; | |
dabe1954 | 2524 | drm_dp_put_port(port); |
ad7f8a1f DA |
2525 | return true; |
2526 | } | |
2527 | } | |
2528 | ||
2529 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); | |
2530 | if (ret) { | |
2531 | DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); | |
2532 | goto out; | |
2533 | } | |
2534 | DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); | |
2535 | *slots = port->vcpi.num_slots; | |
2536 | ||
2537 | drm_dp_put_port(port); | |
2538 | return true; | |
2539 | out: | |
2540 | return false; | |
2541 | } | |
2542 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); | |
2543 | ||
87f5942d DA |
2544 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
2545 | { | |
2546 | int slots = 0; | |
2547 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2548 | if (!port) | |
2549 | return slots; | |
2550 | ||
2551 | slots = port->vcpi.num_slots; | |
2552 | drm_dp_put_port(port); | |
2553 | return slots; | |
2554 | } | |
2555 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); | |
2556 | ||
ad7f8a1f DA |
2557 | /** |
2558 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI | |
2559 | * @mgr: manager for this port | |
2560 | * @port: unverified pointer to a port. | |
2561 | * | |
2562 | * This just resets the number of slots for the ports VCPI for later programming. | |
2563 | */ | |
2564 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2565 | { | |
2566 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2567 | if (!port) | |
2568 | return; | |
2569 | port->vcpi.num_slots = 0; | |
2570 | drm_dp_put_port(port); | |
2571 | } | |
2572 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); | |
2573 | ||
2574 | /** | |
2575 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI | |
2576 | * @mgr: manager for this port | |
2577 | * @port: unverified port to deallocate vcpi for | |
2578 | */ | |
2579 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) | |
2580 | { | |
2581 | port = drm_dp_get_validated_port_ref(mgr, port); | |
2582 | if (!port) | |
2583 | return; | |
2584 | ||
2585 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
2586 | port->vcpi.num_slots = 0; | |
2587 | port->vcpi.pbn = 0; | |
2588 | port->vcpi.aligned_pbn = 0; | |
2589 | port->vcpi.vcpi = 0; | |
2590 | drm_dp_put_port(port); | |
2591 | } | |
2592 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); | |
2593 | ||
2594 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, | |
2595 | int id, struct drm_dp_payload *payload) | |
2596 | { | |
2597 | u8 payload_alloc[3], status; | |
2598 | int ret; | |
2599 | int retries = 0; | |
2600 | ||
2601 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, | |
2602 | DP_PAYLOAD_TABLE_UPDATED); | |
2603 | ||
2604 | payload_alloc[0] = id; | |
2605 | payload_alloc[1] = payload->start_slot; | |
2606 | payload_alloc[2] = payload->num_slots; | |
2607 | ||
2608 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); | |
2609 | if (ret != 3) { | |
2610 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); | |
2611 | goto fail; | |
2612 | } | |
2613 | ||
2614 | retry: | |
2615 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
2616 | if (ret < 0) { | |
2617 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
2618 | goto fail; | |
2619 | } | |
2620 | ||
2621 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { | |
2622 | retries++; | |
2623 | if (retries < 20) { | |
2624 | usleep_range(10000, 20000); | |
2625 | goto retry; | |
2626 | } | |
2627 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); | |
2628 | ret = -EINVAL; | |
2629 | goto fail; | |
2630 | } | |
2631 | ret = 0; | |
2632 | fail: | |
2633 | return ret; | |
2634 | } | |
2635 | ||
2636 | ||
2637 | /** | |
2638 | * drm_dp_check_act_status() - Check ACT handled status. | |
2639 | * @mgr: manager to use | |
2640 | * | |
2641 | * Check the payload status bits in the DPCD for ACT handled completion. | |
2642 | */ | |
2643 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) | |
2644 | { | |
2645 | u8 status; | |
2646 | int ret; | |
2647 | int count = 0; | |
2648 | ||
2649 | do { | |
2650 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); | |
2651 | ||
2652 | if (ret < 0) { | |
2653 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); | |
2654 | goto fail; | |
2655 | } | |
2656 | ||
2657 | if (status & DP_PAYLOAD_ACT_HANDLED) | |
2658 | break; | |
2659 | count++; | |
2660 | udelay(100); | |
2661 | ||
2662 | } while (count < 30); | |
2663 | ||
2664 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { | |
2665 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); | |
2666 | ret = -EINVAL; | |
2667 | goto fail; | |
2668 | } | |
2669 | return 0; | |
2670 | fail: | |
2671 | return ret; | |
2672 | } | |
2673 | EXPORT_SYMBOL(drm_dp_check_act_status); | |
2674 | ||
2675 | /** | |
2676 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. | |
2677 | * @clock: dot clock for the mode | |
2678 | * @bpp: bpp for the mode. | |
2679 | * | |
2680 | * This uses the formula in the spec to calculate the PBN value for a mode. | |
2681 | */ | |
2682 | int drm_dp_calc_pbn_mode(int clock, int bpp) | |
2683 | { | |
a9ebb3e4 HW |
2684 | u64 kbps; |
2685 | s64 peak_kbps; | |
2686 | u32 numerator; | |
2687 | u32 denominator; | |
2688 | ||
2689 | kbps = clock * bpp; | |
2690 | ||
2691 | /* | |
2692 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 | |
2693 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on | |
2694 | * common multiplier to render an integer PBN for all link rate/lane | |
2695 | * counts combinations | |
2696 | * calculate | |
2697 | * peak_kbps *= (1006/1000) | |
2698 | * peak_kbps *= (64/54) | |
2699 | * peak_kbps *= 8 convert to bytes | |
2700 | */ | |
2701 | ||
2702 | numerator = 64 * 1006; | |
2703 | denominator = 54 * 8 * 1000 * 1000; | |
2704 | ||
2705 | kbps *= numerator; | |
2706 | peak_kbps = drm_fixp_from_fraction(kbps, denominator); | |
2707 | ||
2708 | return drm_fixp2int_ceil(peak_kbps); | |
ad7f8a1f DA |
2709 | } |
2710 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); | |
2711 | ||
2712 | static int test_calc_pbn_mode(void) | |
2713 | { | |
2714 | int ret; | |
2715 | ret = drm_dp_calc_pbn_mode(154000, 30); | |
a9ebb3e4 HW |
2716 | if (ret != 689) { |
2717 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
2718 | 154000, 30, 689, ret); | |
ad7f8a1f | 2719 | return -EINVAL; |
a9ebb3e4 | 2720 | } |
ad7f8a1f | 2721 | ret = drm_dp_calc_pbn_mode(234000, 30); |
a9ebb3e4 HW |
2722 | if (ret != 1047) { |
2723 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
2724 | 234000, 30, 1047, ret); | |
ad7f8a1f | 2725 | return -EINVAL; |
a9ebb3e4 HW |
2726 | } |
2727 | ret = drm_dp_calc_pbn_mode(297000, 24); | |
2728 | if (ret != 1063) { | |
2729 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", | |
2730 | 297000, 24, 1063, ret); | |
2731 | return -EINVAL; | |
2732 | } | |
ad7f8a1f DA |
2733 | return 0; |
2734 | } | |
2735 | ||
2736 | /* we want to kick the TX after we've ack the up/down IRQs. */ | |
2737 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) | |
2738 | { | |
2739 | queue_work(system_long_wq, &mgr->tx_work); | |
2740 | } | |
2741 | ||
2742 | static void drm_dp_mst_dump_mstb(struct seq_file *m, | |
2743 | struct drm_dp_mst_branch *mstb) | |
2744 | { | |
2745 | struct drm_dp_mst_port *port; | |
2746 | int tabs = mstb->lct; | |
2747 | char prefix[10]; | |
2748 | int i; | |
2749 | ||
2750 | for (i = 0; i < tabs; i++) | |
2751 | prefix[i] = '\t'; | |
2752 | prefix[i] = '\0'; | |
2753 | ||
2754 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); | |
2755 | list_for_each_entry(port, &mstb->ports, next) { | |
51108f25 | 2756 | seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); |
ad7f8a1f DA |
2757 | if (port->mstb) |
2758 | drm_dp_mst_dump_mstb(m, port->mstb); | |
2759 | } | |
2760 | } | |
2761 | ||
2762 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, | |
2763 | char *buf) | |
2764 | { | |
2765 | int ret; | |
2766 | int i; | |
2767 | for (i = 0; i < 4; i++) { | |
2768 | ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); | |
2769 | if (ret != 16) | |
2770 | break; | |
2771 | } | |
2772 | if (i == 4) | |
2773 | return true; | |
2774 | return false; | |
2775 | } | |
2776 | ||
51108f25 JB |
2777 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
2778 | struct drm_dp_mst_port *port, char *name, | |
2779 | int namelen) | |
2780 | { | |
2781 | struct edid *mst_edid; | |
2782 | ||
2783 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); | |
2784 | drm_edid_get_monitor_name(mst_edid, name, namelen); | |
2785 | } | |
2786 | ||
ad7f8a1f DA |
2787 | /** |
2788 | * drm_dp_mst_dump_topology(): dump topology to seq file. | |
2789 | * @m: seq_file to dump output to | |
2790 | * @mgr: manager to dump current topology for. | |
2791 | * | |
2792 | * helper to dump MST topology to a seq file for debugfs. | |
2793 | */ | |
2794 | void drm_dp_mst_dump_topology(struct seq_file *m, | |
2795 | struct drm_dp_mst_topology_mgr *mgr) | |
2796 | { | |
2797 | int i; | |
2798 | struct drm_dp_mst_port *port; | |
51108f25 | 2799 | |
ad7f8a1f DA |
2800 | mutex_lock(&mgr->lock); |
2801 | if (mgr->mst_primary) | |
2802 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); | |
2803 | ||
2804 | /* dump VCPIs */ | |
2805 | mutex_unlock(&mgr->lock); | |
2806 | ||
2807 | mutex_lock(&mgr->payload_lock); | |
51108f25 JB |
2808 | seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, |
2809 | mgr->max_payloads); | |
ad7f8a1f DA |
2810 | |
2811 | for (i = 0; i < mgr->max_payloads; i++) { | |
2812 | if (mgr->proposed_vcpis[i]) { | |
51108f25 JB |
2813 | char name[14]; |
2814 | ||
ad7f8a1f | 2815 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
51108f25 JB |
2816 | fetch_monitor_name(mgr, port, name, sizeof(name)); |
2817 | seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, | |
2818 | port->port_num, port->vcpi.vcpi, | |
2819 | port->vcpi.num_slots, | |
2820 | (*name != 0) ? name : "Unknown"); | |
ad7f8a1f | 2821 | } else |
51108f25 | 2822 | seq_printf(m, "vcpi %d:unused\n", i); |
ad7f8a1f DA |
2823 | } |
2824 | for (i = 0; i < mgr->max_payloads; i++) { | |
2825 | seq_printf(m, "payload %d: %d, %d, %d\n", | |
2826 | i, | |
2827 | mgr->payloads[i].payload_state, | |
2828 | mgr->payloads[i].start_slot, | |
2829 | mgr->payloads[i].num_slots); | |
2830 | ||
2831 | ||
2832 | } | |
2833 | mutex_unlock(&mgr->payload_lock); | |
2834 | ||
2835 | mutex_lock(&mgr->lock); | |
2836 | if (mgr->mst_primary) { | |
2837 | u8 buf[64]; | |
2838 | bool bret; | |
2839 | int ret; | |
2840 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); | |
2841 | seq_printf(m, "dpcd: "); | |
2842 | for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) | |
2843 | seq_printf(m, "%02x ", buf[i]); | |
2844 | seq_printf(m, "\n"); | |
2845 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); | |
2846 | seq_printf(m, "faux/mst: "); | |
2847 | for (i = 0; i < 2; i++) | |
2848 | seq_printf(m, "%02x ", buf[i]); | |
2849 | seq_printf(m, "\n"); | |
2850 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); | |
2851 | seq_printf(m, "mst ctrl: "); | |
2852 | for (i = 0; i < 1; i++) | |
2853 | seq_printf(m, "%02x ", buf[i]); | |
2854 | seq_printf(m, "\n"); | |
2855 | ||
44790462 DA |
2856 | /* dump the standard OUI branch header */ |
2857 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); | |
2858 | seq_printf(m, "branch oui: "); | |
2859 | for (i = 0; i < 0x3; i++) | |
2860 | seq_printf(m, "%02x", buf[i]); | |
2861 | seq_printf(m, " devid: "); | |
51108f25 | 2862 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
44790462 | 2863 | seq_printf(m, "%c", buf[i]); |
51108f25 | 2864 | |
44790462 DA |
2865 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); |
2866 | seq_printf(m, "\n"); | |
ad7f8a1f DA |
2867 | bret = dump_dp_payload_table(mgr, buf); |
2868 | if (bret == true) { | |
2869 | seq_printf(m, "payload table: "); | |
2870 | for (i = 0; i < 63; i++) | |
2871 | seq_printf(m, "%02x ", buf[i]); | |
2872 | seq_printf(m, "\n"); | |
2873 | } | |
2874 | ||
2875 | } | |
2876 | ||
2877 | mutex_unlock(&mgr->lock); | |
2878 | ||
2879 | } | |
2880 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); | |
2881 | ||
2882 | static void drm_dp_tx_work(struct work_struct *work) | |
2883 | { | |
2884 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); | |
2885 | ||
2886 | mutex_lock(&mgr->qlock); | |
cb021a3e | 2887 | if (!list_empty(&mgr->tx_msg_downq)) |
ad7f8a1f DA |
2888 | process_single_down_tx_qlock(mgr); |
2889 | mutex_unlock(&mgr->qlock); | |
2890 | } | |
2891 | ||
91a25e46 ML |
2892 | static void drm_dp_free_mst_port(struct kref *kref) |
2893 | { | |
2894 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); | |
2895 | kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); | |
2896 | kfree(port); | |
2897 | } | |
2898 | ||
6b8eeca6 DA |
2899 | static void drm_dp_destroy_connector_work(struct work_struct *work) |
2900 | { | |
2901 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); | |
4772ff03 | 2902 | struct drm_dp_mst_port *port; |
df4839fd | 2903 | bool send_hotplug = false; |
6b8eeca6 DA |
2904 | /* |
2905 | * Not a regular list traverse as we have to drop the destroy | |
2906 | * connector lock before destroying the connector, to avoid AB->BA | |
2907 | * ordering between this lock and the config mutex. | |
2908 | */ | |
2909 | for (;;) { | |
2910 | mutex_lock(&mgr->destroy_connector_lock); | |
4772ff03 ML |
2911 | port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); |
2912 | if (!port) { | |
6b8eeca6 DA |
2913 | mutex_unlock(&mgr->destroy_connector_lock); |
2914 | break; | |
2915 | } | |
4772ff03 | 2916 | list_del(&port->next); |
6b8eeca6 DA |
2917 | mutex_unlock(&mgr->destroy_connector_lock); |
2918 | ||
91a25e46 ML |
2919 | kref_init(&port->kref); |
2920 | INIT_LIST_HEAD(&port->next); | |
2921 | ||
4772ff03 ML |
2922 | mgr->cbs->destroy_connector(mgr, port->connector); |
2923 | ||
2924 | drm_dp_port_teardown_pdt(port, port->pdt); | |
36e3fa6a | 2925 | port->pdt = DP_PEER_DEVICE_NONE; |
4772ff03 | 2926 | |
91a25e46 | 2927 | if (!port->input && port->vcpi.vcpi > 0) { |
fd2d2bac AG |
2928 | drm_dp_mst_reset_vcpi_slots(mgr, port); |
2929 | drm_dp_update_payload_part1(mgr); | |
2930 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); | |
91a25e46 ML |
2931 | } |
2932 | ||
2933 | kref_put(&port->kref, drm_dp_free_mst_port); | |
df4839fd | 2934 | send_hotplug = true; |
6b8eeca6 | 2935 | } |
df4839fd DA |
2936 | if (send_hotplug) |
2937 | (*mgr->cbs->hotplug)(mgr); | |
6b8eeca6 DA |
2938 | } |
2939 | ||
ad7f8a1f DA |
2940 | /** |
2941 | * drm_dp_mst_topology_mgr_init - initialise a topology manager | |
2942 | * @mgr: manager struct to initialise | |
2943 | * @dev: device providing this structure - for i2c addition. | |
2944 | * @aux: DP helper aux channel to talk to this device | |
2945 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit | |
2946 | * @max_payloads: maximum number of payloads this GPU can source | |
2947 | * @conn_base_id: the connector object ID the MST device is connected to. | |
2948 | * | |
2949 | * Return 0 for success, or negative error code on failure | |
2950 | */ | |
2951 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, | |
2952 | struct device *dev, struct drm_dp_aux *aux, | |
2953 | int max_dpcd_transaction_bytes, | |
2954 | int max_payloads, int conn_base_id) | |
2955 | { | |
2956 | mutex_init(&mgr->lock); | |
2957 | mutex_init(&mgr->qlock); | |
2958 | mutex_init(&mgr->payload_lock); | |
6b8eeca6 | 2959 | mutex_init(&mgr->destroy_connector_lock); |
ad7f8a1f | 2960 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
6b8eeca6 | 2961 | INIT_LIST_HEAD(&mgr->destroy_connector_list); |
ad7f8a1f DA |
2962 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
2963 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); | |
6b8eeca6 | 2964 | INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); |
ad7f8a1f DA |
2965 | init_waitqueue_head(&mgr->tx_waitq); |
2966 | mgr->dev = dev; | |
2967 | mgr->aux = aux; | |
2968 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; | |
2969 | mgr->max_payloads = max_payloads; | |
2970 | mgr->conn_base_id = conn_base_id; | |
4d6a10da ID |
2971 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
2972 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) | |
2973 | return -EINVAL; | |
ad7f8a1f DA |
2974 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
2975 | if (!mgr->payloads) | |
2976 | return -ENOMEM; | |
2977 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); | |
2978 | if (!mgr->proposed_vcpis) | |
2979 | return -ENOMEM; | |
2980 | set_bit(0, &mgr->payload_mask); | |
441388a8 ID |
2981 | if (test_calc_pbn_mode() < 0) |
2982 | DRM_ERROR("MST PBN self-test failed\n"); | |
2983 | ||
ad7f8a1f DA |
2984 | return 0; |
2985 | } | |
2986 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); | |
2987 | ||
2988 | /** | |
2989 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. | |
2990 | * @mgr: manager to destroy | |
2991 | */ | |
2992 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) | |
2993 | { | |
274d8352 | 2994 | flush_work(&mgr->work); |
6b8eeca6 | 2995 | flush_work(&mgr->destroy_connector_work); |
ad7f8a1f DA |
2996 | mutex_lock(&mgr->payload_lock); |
2997 | kfree(mgr->payloads); | |
2998 | mgr->payloads = NULL; | |
2999 | kfree(mgr->proposed_vcpis); | |
3000 | mgr->proposed_vcpis = NULL; | |
3001 | mutex_unlock(&mgr->payload_lock); | |
3002 | mgr->dev = NULL; | |
3003 | mgr->aux = NULL; | |
3004 | } | |
3005 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); | |
3006 | ||
3007 | /* I2C device */ | |
3008 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, | |
3009 | int num) | |
3010 | { | |
3011 | struct drm_dp_aux *aux = adapter->algo_data; | |
3012 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); | |
3013 | struct drm_dp_mst_branch *mstb; | |
3014 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; | |
3015 | unsigned int i; | |
3016 | bool reading = false; | |
3017 | struct drm_dp_sideband_msg_req_body msg; | |
3018 | struct drm_dp_sideband_msg_tx *txmsg = NULL; | |
3019 | int ret; | |
3020 | ||
3021 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); | |
3022 | if (!mstb) | |
3023 | return -EREMOTEIO; | |
3024 | ||
3025 | /* construct i2c msg */ | |
3026 | /* see if last msg is a read */ | |
3027 | if (msgs[num - 1].flags & I2C_M_RD) | |
3028 | reading = true; | |
3029 | ||
ae491542 | 3030 | if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { |
ad7f8a1f DA |
3031 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
3032 | ret = -EIO; | |
3033 | goto out; | |
3034 | } | |
3035 | ||
ae491542 | 3036 | memset(&msg, 0, sizeof(msg)); |
ad7f8a1f DA |
3037 | msg.req_type = DP_REMOTE_I2C_READ; |
3038 | msg.u.i2c_read.num_transactions = num - 1; | |
3039 | msg.u.i2c_read.port_number = port->port_num; | |
3040 | for (i = 0; i < num - 1; i++) { | |
3041 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; | |
3042 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; | |
3043 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; | |
3044 | } | |
3045 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; | |
3046 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; | |
3047 | ||
3048 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); | |
3049 | if (!txmsg) { | |
3050 | ret = -ENOMEM; | |
3051 | goto out; | |
3052 | } | |
3053 | ||
3054 | txmsg->dst = mstb; | |
3055 | drm_dp_encode_sideband_req(&msg, txmsg); | |
3056 | ||
3057 | drm_dp_queue_down_tx(mgr, txmsg); | |
3058 | ||
3059 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); | |
3060 | if (ret > 0) { | |
3061 | ||
3062 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ | |
3063 | ret = -EREMOTEIO; | |
3064 | goto out; | |
3065 | } | |
3066 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { | |
3067 | ret = -EIO; | |
3068 | goto out; | |
3069 | } | |
3070 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); | |
3071 | ret = num; | |
3072 | } | |
3073 | out: | |
3074 | kfree(txmsg); | |
3075 | drm_dp_put_mst_branch_device(mstb); | |
3076 | return ret; | |
3077 | } | |
3078 | ||
3079 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) | |
3080 | { | |
3081 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | | |
3082 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | | |
3083 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | | |
3084 | I2C_FUNC_10BIT_ADDR; | |
3085 | } | |
3086 | ||
3087 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { | |
3088 | .functionality = drm_dp_mst_i2c_functionality, | |
3089 | .master_xfer = drm_dp_mst_i2c_xfer, | |
3090 | }; | |
3091 | ||
3092 | /** | |
3093 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX | |
3094 | * @aux: DisplayPort AUX channel | |
3095 | * | |
3096 | * Returns 0 on success or a negative error code on failure. | |
3097 | */ | |
3098 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) | |
3099 | { | |
3100 | aux->ddc.algo = &drm_dp_mst_i2c_algo; | |
3101 | aux->ddc.algo_data = aux; | |
3102 | aux->ddc.retries = 3; | |
3103 | ||
3104 | aux->ddc.class = I2C_CLASS_DDC; | |
3105 | aux->ddc.owner = THIS_MODULE; | |
3106 | aux->ddc.dev.parent = aux->dev; | |
3107 | aux->ddc.dev.of_node = aux->dev->of_node; | |
3108 | ||
3109 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), | |
3110 | sizeof(aux->ddc.name)); | |
3111 | ||
3112 | return i2c_add_adapter(&aux->ddc); | |
3113 | } | |
3114 | ||
3115 | /** | |
3116 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter | |
3117 | * @aux: DisplayPort AUX channel | |
3118 | */ | |
3119 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) | |
3120 | { | |
3121 | i2c_del_adapter(&aux->ddc); | |
3122 | } |